In What Way Do the Theories of Maslow and Alderfer

In what way do the theories of Maslow and Alderfer differ?

A) Unlike Alderfer, Maslow believed that self-actualization forms the base of the needs-hierarchy.
B) Unlike Maslow, Alderfer believed that a person can be motivated by needs from multiple levels at a time.
C) Unlike Maslow, Alderfer believed that as lower-level needs become satisfied, people seek to satisfy higher-level needs.
D) Unlike Alderfer, Maslow believed that when people experience need frustration, they focus upon satisfying higher-level needs.
E) Unlike Maslow, Alderfer believed that physiological needs form the pinnacle of the needs-hierarchy.