Early protocols recorded a byte count to indicate the length of a frame instead of using flag bytes to mark the ends. What was the greatest weakness of this approach?

Select one:

a.

Using a byte count means there will be a maximum size for any data frame.

b.

The data frame needs to be a multiple of 8 bits in length.

c.

It can be difficult for the data link layer framing to re-synchronize after a framing error.