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: HP L9K18UT#ABA Workstation Z240 Mini Desktop, 4 GB RAM, 1 TB HDD, Intel HD Graphics 530, Black
Product description: The HP Z240 packs the performance, features, and reliability of a workstation into the price point of a desktop PC. HP's Z240 offers more performance, greater storage capacity, more IO and greater flexibility while retaining the same form factor of the previous generations.
Product feature: Achieve the performance you need with amazingly powerful processors, Take on challenging tasks with confidence with DDR4 ECC memory, Utilize a USB front fast charging port to charge your device while your HP Z240 is plugged in
Product brand: HP
Target attributes: Number of Cores
Answer: attribute: number of cores
value: None
source: None