Which of the following statements are true regarding emulation? (Choose TWO correct answers.)

A.
Emulation can only provide distinct hardware components but no complete virtual machines.

B.
Emulation requires changes to the guest operating system.

C.
Emulation reimplements a whole computing system in software.

D.
Emulation allows operating systems to be run on foreign architectures.

E.
Emulation is one of the most resource efficient virtualization techniques.