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

Input:
Product title: 5-Pack SDSDB2L-004G-A46 SDHC 4GB Memory Card SanDisk Secure Digital Card
Product description: This 4GB SDHC Memory Card Class 4 from SanDisk is a highly secure stamp-sized flash memory card, which can be used in a variety of digital products including digital music players, cellular phones, handheld PCs, digital cameras, digital video camcorders, smart phones, car navigation systems and electronic books, that conform to the SD 2.00 specification (rated Class 4 for speed and performance). The SDHC Card features a 15MB/s write speed and also contains a security feature for the protection of copyrighted data.
Product feature: SDHC 4GB Memory Card 5-Pack, SanDisk Secure Digital Card, Fast Shipping!
Product brand: SanDisk
Target attributes: Format
Answer: attribute: format
value: secure digital
source: product feature
attribute: format
value: sdhc
source: product feature
attribute: format
value: sd
source: product description
attribute: format
value: sdhc
source: product title
attribute: format
value: sdhc
source: product description