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[19] What does the following code do: CMA INC a) Performs 1's complement of AC b) Performs 2's complement of AC c) Increments AC by 1 d) Subtracts 1 from AC 2. 20] Given the content of AC=6C25,PC=205, the content of memory at address 205 is 144A, the content of memory at address 44A is 123C. What would be the content of AC after execution? a) 7E61 b) 123C c) 144A d) 0205 [21] Which BC register among the following hasn't a clear input? a) TR b) DR c) IR d) AC [22] The Assembler uses a Location Counter (LC) to: a) Keep track of the location of both instructions and operands being processed. b) Count the number of symbols on the assembly program. c) Save the Pass number during translation. d) Store the machine code of each instruction