Which three are distinctions between asymmetric and symmetric algorithms?

Which three are distinctions between asymmetric and symmetric algorithms? (Choose all that apply.)

A.
Asymmetric algorithms are based on more complex mathematical computations.

B.
Only symmetric algorithms have a key exchange technology built in.

C.
Only asymmetric algorithms have a key exchange technology built in.

D.
Asymmetric algorithms are used quite often as key exchange protocols for symmetric algorithms.