Discussion
Assertion (A) : A programmable Read-Only-Memory can be used as a synchronous counter.
Reason (R) : Each memory location of a programmable Read-Only-Memory is programmed and can be read synchronously.
Answer: C
A PROM can store the next-state table of a counter, with the present state as the address and the next state as the stored word, so that the outputs fed back through a register give a counter; so (A) is true. The official key marks (R) as false, as each location of a PROM is programmed once, but the data is read asynchronously, without a clock. The answer is (A) is true and (R) is false.
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