Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Dell Latitude E7440 14" LED Ultrabook Intel Core i7 i7-4600U 8GB RAM 256GB SSD Windows 8.1 Professional
Product description: Dell Latitude E7440 Windows 8.1 Pro (64Bit) 14 Inch HD (1366x768) Anti-Glare WLED-backlit Processor: Intel Core 4th Generation i7-4600U Processor (4M Cache, up to 3.30 GHz) 8GB (2x4GB) 1600MHz DDR3L Memory 256GB mSATA Solid State Drive Intel Dual Band Wireless-AC 7260 802.11ac/a/b/g/n 2x2 + Bluetooth 4.0 LE Half Mini Card Intel HD Graphics 3 Cell (34Wh) Battery 65W 3-Pin, AC Adapter mSATA Interposer Windows 8.1 64BIT Internal English Dual Pointing Keyboard LCD Cover Dell Data Protection Encryption Personal Edition Digital Delivery INTEL VPRO TECHNOLOGY ADV MGMT FEATURES Power Cord McAfee Security Center, 30 Day Office 365 - 1 Month Trial (Internet access required to install & activate) No Web Cam and No Microphone No Fingerprint Reader and No Smart Card Reader (Contact and Contactless) Palmrest No SmartCard No Modem LT E7440 : 3 Year Basic Hardware Service with 3 Year NBD Limited Onsite Service After Remote Diagnosis (From Dell)
Product feature: 4th Gen Intel Core i7-4600U Processor (4M Cache, up to 3.30 GHz), Windows 8.1 Professional, 14 Inch HD (1366x768) Anti-Glare WLED-backlit, 8GB DDR3L at 1600MHz, 256GB mSATA Solid State Drive, Intel HD Graphics 4400, Intel Dual Band Wireless-AC 7260 802.11ac/a/b/g/n 2x2 + Bluetooth 4.0 LE Half Mini Card, 3 years Dell Warranty
Product brand: Dell
Target attributes: Number of Cores
Answer: attribute: number of cores
value: None
source: None