Which layer is responsible for compression and decompression?

A. Application layer
B. Physical layer
C. Session layer
D. Presentation layer

D. The Presentation layer is responsible for compression and decompression. Compression methods can be MP3, JPG, and ZIP, which reduce the number of bits that need to be transmitted over the network. Often web servers use gzip to speed up page delivery. One end compresses and the other end decompresses the data.