Using more than one medium of expression or communication is considered A) Multimedia.
mul·ti·me·di·a
/ˌməltēˈmēdēə,ˌməltīˈmēdēə/
adjective
1.
(of art, education, etc.) using more than one medium of expression or communication.
"a multimedia art form"
D. He has been saving to get a new computer is the correct answer.