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: XFX ATI Radeon HD6770 1 GB DDR5 VGA/DVI/HDMI PCI-Express Video Card HD677XZNLC
Product description: XFX ATI Radeon HD6770 1GB DDR5 VGA/DVI/HDMI PCI-Express Video Card
Product feature: Chipset: Radeon HD6770; Engine Clock: 850 MHz, Video Memory: 1GB DDR5; Memory Clock: 4800 MHz; Memory Interface: 128-bit; Bus: PCI-Express 2.1 x16, RAMDAC: 400 MHz; Stream Processors: 800; Max. Resolution: 2560 x 1600; Connectors: VGA, DVI, HDMI; Thermal: Fansink, Support Microsoft Windows 7; Support ATI CrossFireX Technology; Support ATI Stream Technology; Support AMD Eyefinity Technology;, Support AMD Accelerated Parallel Processing (APP) Technology; Support HDCP - High-bandwidth Digital Content Protection; Support Microsoft DirectX 11,, Shader Model 5.0 and Open GL 4.1; Minimum Power Requirement: 650W, Support ATI PowerPlay Technology; Support AMD HD3D Technology
Product brand: XFX
Target attributes: DVI Output Type
Answer: attribute: dvi output type
value: None
source: None