If the PPP protocol uses synchronous transmission technology and the bit
string "01011111001111101" appears in the data segment received by the receiving end , the real data should be (B)
A. 0101111100111111
B. 010111110111111
C. 0101111100011111001
D. 01011111001111101
Note: There are two transmission methods in the ppp protocol: synchronous transmission and asynchronous transmission, and the corresponding implementation methods are:
同步传输：零比特填充
The sender adds 1 0 after 5 consecutive 1s, and the
receiver deletes 1 0 after 5 consecutive 1s.
异步传输：字节填充
Sending end:
After ox7E occurs, converting it into ox7D, ox5E
appears after ox7D, converting it into ox7D, ox5D
receiving end:
the transmitting end the reverse process
occurs ox7D, after ox5E, converting it into ox7E
appears after ox7D, ox5D the It turns into ox7D
Solve this problem