Although Long-Standing Enemies,Apple and IBM Formed an Alliance Partnership

Although long-standing enemies,Apple and IBM formed an alliance partnership.How did this partnership benefit both Apple and IBM?

A) Apple's core competency with consumer services and IBM's core competency with business services complemented each other.
B) Apple's core competency with business services and IBM's core competency with consumer services complemented each other.
C) Apple's core competency with marketing and IBM's core competency with manufacturing complemented each other.
D) Apple's core competency with manufacturing and IBM's core competency with marketing complemented each other.