14.000 12,000 - Compact disc 5 10.000 - 8.000 - Retail dollar sales (in millions) 6.000 - 4000 Cassette tape Digital 2.000 music 1 1 1 1 1 0 5661 SOS: 2003 2001 2002 2009 2019 2017 1991 1989 1999 2005 1983 1995 1987 201 201 2015 Years Figure 10-4 Figure 10-4 shows that in 2005, digital music (mp3) downloads were in which stage of the product life cycle? introduction O growth maturity O harvest