The message bit sequence to a DPSK modulator is 1, 1, 0, 0, 1, 1. The carrier phase during the reception of the first two message bits is π, π. The carrier phase for the remaining four message bits is

A. π, π, 0, π

B. 0, 0, π, π

C. 0, π, π, π

D. π, π, 0, 0

Answer: Option C

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