What is the chipping code in DSSS used for?

A.
It is made up of sub-bits that are combined with the original bits before transmission and provide parity protection.

B.
It is made up of sub-bits that are combined with the original bits before transmission and provide encryption protection.

C.
It is made up of new frequencies that are combined with the original bits before transmission and provide parity protection.

D.
It is made up of new frequencies that are combined with the original bits before transmission and provide encryption protection.

Explanation:
DSSS takes a different approach by applying sub-bits to a message. The
sub-bits are used by the sending system to generate a different format of the data
before it is transmitted. The receiving end uses these bits to reassemble the signal
into the original data format. The sub-bits are collectively called a chip, and the
sequence of how the sub-bits are applied is referred to as the chipping code. They
work as parity. If a bit is corrupted during transmission, the receiving system uses
the sub-bit to rebuild the original bit.