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Dynamic memory refreshes periodically so due to refreshment it is difficult to interface it
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Dynamic random-access memory (DRAM) is a type of random access semiconductor memory that stores each bit of data in a separate tiny capacitor within an integrated circuit.
The electric charge on the capacitors slowly leaks off, so without intervention the data on the chip would soon be lost.
To prevent this, DRAM requires an external memory refresh circuit which periodically rewrites the data in the capacitors, restoring them to their original charge. This refresh process is the defining characteristic of dynamic random-access memory, in contrast to static random-access memory (SRAM) which does not require data to be refreshed.
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Option B

Dynamic random-access memory (DRAM) is a type of random access semiconductor memory that stores each bit of data in a separate tiny capacitor within an integrated circuit.
The electric charge on the capacitors slowly leaks off, so without intervention the data on the chip would soon be lost.
To prevent this, DRAM requires an external memory refresh circuit which periodically rewrites the data in the capacitors, restoring them to their original charge. This refresh process is the defining characteristic of dynamic random-access memory, in contrast to static random-access memory (SRAM) which does not require data to be refreshed.so we can say Dynamic memory is difficult to interface with processor

 

 

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Option C is right ..

ROM is super slow in front of the processor, therefore if it was interfaced, the performance of the system will decrease, so in this sense, it is difficult to interface with CPU

 

RAM or main memory is DRAM only, and it is interfaced with CPU as we all know using a memory module which takes care of refreshing and decoding stuffs,etc and the cache is SRAM and directly interfaced with the CPU chips

 

I suppose it is option C

 

The question is ambiguous and vague, it should have clearly defined what is meant by interfacing, directly or indirectly
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