An op amp follower circuit is useful because
A. the output voltage is equal to the input voltage and the input current is very large
B. the output voltage is the negative of the input voltage and the input current is very large
C. the output is fixed (i.e., doesn't change) even when the input changes
D. the output voltage is equal to the input voltage and the input current is almost zero
E. the output voltage is the negative of the input voltage and the input current is almost zero
Answer: D
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