In a digital communication system, what does the term "bit error rate" (BER) refer to?
A. The ratio of the number of bits received incorrectly to the total number of bits transmitted
B. The number of bits transmitted per second
C. The ratio of the bandwidth to the frequency of the signal
D. The strength of the transmitted signal
Explanation:
The Bit Error Rate (BER) is the ratio of incorrectly received bits to the total number of bits transmitted, a measure of the error performance of the system.