Two computers that communicate with each other use a simple parity check to detect errors for ASCII transmissions. Which of the following events will always lead to an undeleted error?
A:
one bit or any odd number of bits inverted in a block of data during transmission
B:
two bits or any even number of bits inverted in a block during transmission
C:
one bit or any odd number of bits inverted in a byte during transmission
D:
two bits or any even number of bits inverted in a byte during transmission
A smart modem can dial, hang up and answer incoming calls automatically. Can you tell who provides the appropriate instruction to the modem for this purpose?
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