MP3 was designed by the Moving Picture Experts Group (MPEG) as part of its <answer>MPEG-1</answer> standard and later extended in the MPEG-2 standard. The first subgroup for audio was formed by several teams of engineers at Fraunhofer IIS, University of Hannover, AT&T-Bell Labs, Thomson-Brandt, CCETT, and others. <answer>MPEG-1</answer> Audio (<answer>MPEG-1</answer> Part 3), which included <answer>MPEG-1</answer> Audio Layer I, II and III was approved as a committee draft of ISO/IEC standard in 1991, finalised in 1992 and published in 1993 (ISO/IEC 11172-3:1993). Backwards compatible MPEG-2 Audio (MPEG-2 Part 3) with additional bit rates and sample rates was published in 1995 (ISO/IEC 13818-3:1995).
What was the first standard that this group had?
MPEG-1