Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: Sapphire Radeon RX 480 4GB GDDR5 HDMI / Triple DP (UEFI) PCI-Express Graphics Card 21260-01-20G
Product description: Sapphire Radeon RX 480 4GB GDDR5 HDMI / triple DP (UEFI) PCI-Express graphics card
Product feature: 256-bit Memory bus, GDDR5 Memory Type, 1 x HDMI, 3 x DisplayPort
Product brand: Sapphire Technology
Target attributes: Output Resolution
Answer: attribute: output resolution
value: None
source: None