Question: In the DES algorithm the Round Input is 3 2 bits, which is expanded to 4 8 bits via _ _ _ _ _ _

In the DES algorithm the Round Input is 32 bits, which is expanded to 48 bits via ____________
Select one:
a. Addition of ones
b. Addition of zeros
c. Scaling of the existing bits
d. Duplication of the existing bits

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KEY QUESTION Refer to Figure 3.6, page