Which of the following is an audio codec that provides high-quality audio output?

A.
G.711

B.
G.729

C.
H.261

D.
H.263

E.
H.264

Explanation:
711 is an audio codec that provides high-quality audio output. However, the high quality comes at the expense
of bandwidth. By contrast, G.729 provides lower-quality audio output and requires much less bandwidth;
however, G.729 does not transmit fax signals, touch tones, or any other type of complex audio very well.
H.261, H.263, and H.264 are not audio codecs; they are video codecs. H.264 is the default-video compression
format for most Cisco IP video endpoints and supports high definition (HD) video. By contrast, neither H.261
nor H.263 supports HD video.Reference:
Cisco: Cisco Video and TelePresence Architecture Design Guide: Basic Video Concepts: Video Compression
Formats