What kind of audio format (LPCM/Dolby Digital-Stereo creator/ Dolby Digital - 5.1 creator) should I select?

The different audio formats are as follows: LPCM is an uncompressed audio format. The Dolby Digital audio AC3 format (OEM optional) uses the Dolby Digital Consumer Encoder format. MPEG audio uses the MPEG-1 audio compression format. (This audio format may have compatibility issues in NTSC.) MP3 (optional) uses the MPEG-1 Layer3 audio format.