Question: A. R. D. Prasad is a specialist in what type of text displayed on a screen with references that are easily accessible?
Context: The Bow Hut is an alpine hut located at an elevation of 2350 m on the eastern edge of the Wapta Icefield in Banff National Park.  It is the largest, best equipped, and most accessible of the four alpine huts on the Wapta Icefield, and serves as the base for a wide variety of ski tours and mountaineering ascents to half a dozen peaks on the Wapta.  It is the easiest and safest starting point for the Wapta traverse; and Balfour Hut, the next hut on the traverse, can easily be reached from it in a day.  It can also serve as an intermediate stop in a longer traverse which starts at the less easily accessible Peyto Hut.  The hut is maintained by the Alpine Club of Canada. Les Roches Percées (The leaky Rocks "in english") is an uninhabited island in the archipelago of Îles des Saintes including the commune (municipality) of Terre-de-Haut.  It is located unless 15 m of the beach of Pompierre in the northeast of Terre-de-Haut Island and measures 100 m in its length for 20 m in its width.  It closes the bay of Pompierre and offers only two passages towards the Atlantic ocean, called "Grande Passe" and "Petite Passe".  The island is easily accessible, a tongue of white sand and the shallow depth of the water allow to cross easily by "Petite Passe" passage.  The north headland of the island, marking out "Grande Passe" passage, dives on a coral reef.  It is characterized by high rocks abrupt which the erosion dug impressive fractures by which the sea rushes.  These faults are at the origin of the naming of the island. The Ritter Range is a small mountain range within California's Sierra Nevada.  Most of the mountain range lies within the Ansel Adams Wilderness.  The Range is easily viewed from Minaret Summit, which is accessible by motor vehicle.  The Ritter Range is most easily accessible from Mammoth Lakes, where hiking trails lead to lakes throughout the range.  The John Muir Trail passes by many lakes within the Ritter Range.  The most prominent peaks of the Ritter Range are Mount Ritter, at 13,143 feet, Banner Peak, at 12,936 feet, and the Minarets, a group of sharp peaks south of Mt. Ritter.  Thousand Island Lake, Ediza Lake, Garnet Lake, Lake Catherine, Minaret Lake, Cecile Lake, and Shadow Lake all lie within the Ritter Range, and are accessible by trail. Maramkulangara Krishna Temple is an Indian Krishna temple situated at Vennala - Eroor route, easily accessible by road from Palarivattom, Thrippunithura and Vyttila.  (The route from Thrippunithura, was temporarily closed due to the construction of a bridge and now open.)  The principal deity here is Bala Krishna or Krishna in his child form.  This Bala Krishna is termed by natives as "Child Specialist". Classical Otomi is the name used for the Otomi language as spoken in the early centuries of Spanish colonial rule in Mexico and documented by Spanish friars who learned the language in order to catechize the Otomi peoples.  During the colonial period, many Otomis learned to write their language in Roman letters.  As a consequence, a significant number of documents in Otomi, both secular and religious, exist from the period, and the most well-known documents are the Codices of Huichapan and Jilotepec.  Text in classical Otomi is not easily accessible since the Spanish speaking friars failed to differentiate the varied vowel and consonant sounds of the Otomi language. Hypertext is text displayed on a computer or other electronic device with references (hyperlinks) to other text that the reader can immediately access, usually by a mouse click or keypress sequence. The Samsung SGH-T639 is a clamshell mobile phone manufactured by Samsung and offered by T-Mobile.  It has four external changeable faceplates, each with a different color.  All four colors (blue, red, olive, and navy) come with each phone.  The external screen is longer and slenderer than many similar phones, measuring 1.375 inches (3.4 cm) length by 0.4375 inches (1.0 cm) width.  Users can choose the color of the text displayed on the external screen immediately after the phone is closed.  The larger internal screen, which is found by opening the phone in portrait mode, measures 1.75 inches (4.6 cm) by 1.375 inches (3.4 cm) width. Hypertext is text displayed on a computer display or other electronic devices with references (hyperlinks) to other text that the reader can immediately access, or where text can be revealed progressively at multiple levels of detail (also called StretchText).  Hyper<wbr>text documents are interconnected by hyperlinks, which are typically activated by a mouse click, keypress sequence or by touching the screen.  Apart from text, the term "hyper<wbr>text" is also sometimes used to describe tables, images, and other presentational content forms with integrated hyperlinks.  Hyper<wbr>text is one of the key underlying concepts of the World Wide Web, where Web pages are often written in the Hypertext Markup Language (HTML).  As implemented on the Web, hypertext enables the easy-to-use publication of information over the Internet. Dr A.R.D. Prasad is an Indian Library and Information Science Academics, Information professional and Information scientist.  Dr Prasad teaches at Documentation Research and Training Centre (DRTC), Bangalore as Professor of Library and Information Science and at present he is Head of DRTC, which is India's only "proper" ischool with a very strong research program.  His areas of specialisation include Artificial intelligence-Applications in LIS, Natural language processing, Digital Libraries, Hypertext and Multimedia applications, Institutional repository, Open-source software used in Libraries, Open Access to Information, Semantic Web Technology, Free and open source software etc.  His other area of interests are Mythology, Buddhism, Philosophy and Indian History.  He is pioneer in promotion and development of Open-source software used in Libraries and Information Centres in India, Open access (publishing) and Open Access movement.  He is visiting Faculty of University of Trento, Italy. Polyferrocenes are polymers containing ferrocene units.  Ferrocene offers many advantages over pure hydrocarbons when used as a building block of macromolecular chemistry.  It is temperature stable, resistant to acids and alkalis, resistant to air and can be easily manufactured from inexpensive raw materials.  The variety of possible substitutions at the ferrocene parent body results in a multitude of accessible polymers with interesting electronic and photonic properties.  Many polyferrocenes are relatively easily accessible.  Poly(1,1'-ferrocene-silane) can be prepared by ring-opening polymerization and has a variety of interesting properties, such as a high refractive index or semiconductor properties.  Ring-opening polymerization usually leads to polymers containing ferrocene in the backbone.  Besides the latter motif, ferrocene can be attached to the backbone as pendant unit as well. <ref name="DOI10.1039/c6cs00196c">Rudolf Pietschnig: "Polymers with pendant ferrocenes."  In: "Chemical Society Reviews."  45, 2016, S. 5216, . </ref>
Answer: Hypertext