Research on mnemonic devices suggests that they are:________
a. superior to rote rehearsal in terms of both short-and long-term retention.
b. superior to rote rehearsal and elaboration in terms of both short-and long-term retention.
c. superior to rote rehearsal in terms of short-term but not long-term retention.
d. superior to rote rehearsal and elaboration in terms of short-term but not long-term retention.