Refer to the exhibit. An administrator configures fax dial-peers on a Cisco IOS gateway and finds that faxes are not working correctly. Which change should be made to resolve this issue?

G.723.1 is a low-bitrate codec unsuitable for fax transmission due to its high compression, which introduces artifacts that disrupt modem signals.

G.729 is a low-bitrate codec designed for voice, not fax, and its aggressive compression severely degrades fax signals.

G.726 is an ADPCM codec and, while better than G.729, is generally not as reliable as G.711 for fax pass-through or a T.38 fallback.

For reliable fax transmission over IP, the G.711 codec (either ulaw or alaw) is strongly recommended for voice dial-peers that carry fax traffic, whether in pass-through mode or as the fallback for T.38 fax relay. G.711 provides the full 64 kbps bandwidth required for successful modem communication and prevents issues caused by compression algorithms of other codecs.