Pretend you are a teacher preparing a quiz for the text I will provide. 
            Each quiz question should follow the format below. 
            Ensure that you carefully recheck the questions and answers for accuracy. 
            The output should be a ready-to-use list of dictionaries for the Python eval function:

            [

                    "question": "WRITE THE QUESTION HERE",
                    "options": ["A) OPTION_1", "B) OPTION_2", "C) OPTION_3", "D) OPTION_4"],
                    "answer": INDEX_OF_CORRECT_ANSWER_IN_OPTIONS_LIST,
                    "explanation": "EXPLAIN WHY THE ANSWER IS CORRECT"

            ]

            Text:
            Mobile Computing, Year Four, 2024/2025, Lecture 1                         Dr. Alyaa Al-Barrak 
1 
 
1. Introduction to Cellular System 
A large number of users over a large geographic area must be accommodated 
by cellular telephone systems with a limited frequency spectrum, (limited 
number of channels). If a single sender/receiver is used with only a single base 
station (BS), then a sufficient amount of power may not be present at a huge 
distance from the BS. For a large geographic coverage area, a high-powered 
sender, therefore, has to be utilised. But a high-power radio transmitter causes 
harm to the environment. Therefore, a mobile communication system calls for 
replacing the high-power transmitters by low-power transmitters. This goal can 
be achieved by dividing the coverage area into small segments, called cells. A 
certain number of the available channels are utilised by each cell. Moreover, a 
group of adjacent cells together employ all the available channels. Such a group 
is called a cluster. This cluster can repeat itself and as a consequence, the same 
set of channels can be used again and again. 
Each cell has a low-power transmitter with a coverage area equal to the area of 
the cell. The technique of replacing a single high-powered transmitter by 
several low-powered transmitters to support many users is the backbone of the 
cellular concept. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fig 1: Cellular communication system 
 
2. Frequency Management and Channel Assignment: 
2.1. 
Channel Assignment Strategies 
Since the number of mobile users rapidly increased, the limited radio 
spectrum should be effectively utilised by the mobile service providers 
C1 
C2 
C3 
C4 
C5 
C6 
C2  
C1 
C2 
C3 
C4 
C5 
C6 
C2 
C1 
C2 
C3 
C4 
C5 
C6 
C2 
Cells 
Cluster number 2 
contains 7 cells 
Cluster 
number 1 
Cluster 
number 1 
Mobile Computing, Year Four, 2024/2025, Lecture 1                         Dr. Alyaa Al-Barrak 
2 
 
through following strategies which ensure that. In view of the fact that 
low interference and raising capacity being the prime objectives, a 
frequency reuse scheme was employed; moreover, a variety of channel 
assignment strategies have been used. Channel assignment strategies are 
classified into two types: fixed and dynamic. 
➢ Fixed Channel Assignment (FCA) 
In a fixed channel assignment strategy, each cell is allocated a fixed 
number of voice channels. Any communication within the cell can only 
be made with the designated unused channels of that particular cell. 
Suppose if all the channels are occupied, then the call is blocked and 
subscriber has to wait. This is simplest of the channel assignment 
strategies as it requires very simple circuitry but provides worst channel 
utilization. Later there was another approach in which the channels 
were borrowed from the adjacent cell if all of its own designated 
channels were occupied. This was named as borrowing strategy. In 
such cases, the Mobile Switch Centre (MSC) super

            Quiz: