Apple Entered the Music Player Market with Its IPod in 2001

Apple entered the music player market with its iPod in 2001 and by 2014 it had a 70 percent share of this market.However,global MP3 music player unit sales over the past few years have fallen dramatically and were expected to decline further.Apple announced it is discontinuing the iPod Classic (though it will continue to sell other iPod product lines) and will no longer report iPod sales separately in its financial documents.Currently,Apple's iPod SBU appears to be a

A) question mark.
B) star.
C) hedgehog.
D) cash cow.
E) dog.