(Last Word) When They Were First Introduced, ATMs

Multiple Choice

(Last Word) When they were first introduced, ATMs

A) were a substitute for bank tellers, but eventually became a complement.
B) were a substitute for bank tellers, and their existence has continued to depress the demand for tellers.
C) were a complement to bank tellers, but over time have replaced them.
D) had no effect on the demand for bank tellers.