Instruction: Using the product's title, description, features, price, and brand, identify and retrieve the values associated with a specified set of target attributes. Output the extracted values along with their respective sources (e.g., title or feature) indicating where each value was found.

Input:
Product title: Samsung S24C450BW 24-Inch Screen LED-Lit Monitor
Product description: Samsung 24 inch S24C450BW Widescreen 1,000:1 5ms SC450 Series LED Monitor
Product feature: Screen Size: 24" Wide, Resolution: 1920 x 1200, Brightness: 250cd/m, Video Input: VGA/DVI
Product brand: Samsung
Target attributes: Display Type
Answer: attribute: display type
value: led
source: product description
attribute: display type
value: led
source: product title