The Introduction of ATMs in the Banking Industry Illustrates That

The introduction of ATMs in the banking industry illustrates that ATMs

A) can be substitutes for labor in handling cash deposits and withdrawals, but they can be complements for labor in other banking functions.
B) are more productive substitutes for labor in most banking transactions, thereby reducing the long-term demand for labor by banks.
C) increased the demand for labor by banks because the ATMs proved to be less productive substitutes for labor.
D) are much better complements for labor, causing banks to reduce the number of their branch locations.