9A44 A
 A PLL is locked onto an incoming signal with a frequency of 1 MHz at a phase angle of 50 degrees.  The VCO signal feeds the phase detector at a phase angle of 20 degrees. The peak amplitude of the incoming signal is 0.5V and that of the VCO output signal is 0.7V. What is the VCO frequency?
A. 1 MHz.
B. 700 kHz.
C. 1.2 MHz.
D. 200 kHz.
