What does the instruction SUBB A, Rn do?
A) It subtracts the contents of Register Rn and borrows from the accumulator and places the result in the accumulator.
B) It subtracts the contents of Register Rn and borrows from the memory and places the result in the accumulator.
C) It subtracts the contents of accumulator and borrows from the register and places the result in the accumulator.
D) It subtracts the contents of memory and borrows from the accumulator and places the result in the accumulator.
A
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Fill in the blank(s) with the appropriate word(s).