Which among of the following may be employed to synchronise base station to local reference station?

Two signals of different frequency

Four signals of different frequency

Four signals of different phase

Which among of the following may be employed to synchronise base stati

1.	Which among of the following may be employed to synchronise base station to local reference station?
A.	Two signals of different frequency
B.	Two signals of different phase
C.	Four signals of different frequency
D.	Four signals of different phase
Answer» B. Two signals of different phase