Question: What are the mandatory and optional JPEG modes that IMS terminals supporting still images must support, according to 3GPP specifications for media formats and codecs?
Option 1: Mandatory: Progressive DCT, Differential Huffman Coding; Optional: Baseline DCT, Non-Differential Huffman Coding
Option 2: Mandatory: Baseline DCT, Non-Differential Huffman Coding; Optional: Lossless DCT, Differential Huffman Coding
Option 3: Mandatory: Progressive DCT, Non-Differential Huffman Coding; Optional: Baseline DCT, Differential Huffman Coding
Option 4: Mandatory: Baseline DCT, Non-Differential, Huffman Coding (SOF0); Optional: Progressive DCT, Non-Differential, Huffman Coding (SOF2)
Explanation: This question requires understanding of the specific JPEG modes supported by IMS terminals for still images as per 3GPP media format and codec specifications. The correct answer, Option 4, accurately reflects the mandatory baseline DCT mode with non-differential Huffman coding (identified by SOF0) and the optional progressive DCT mode also with non-differential Huffman coding (identified by SOF2), aligning with the detailed requirements for JPEG support in IMS terminals. This highlights the importance of precise codec and mode support for interoperability and compatibility in telecom networks, particularly in multimedia messaging and presence services.