Assume a $64-$bit MAR that is organized with $32$ bits for the row selector and $32$ bits for the column selector.What is the maximum size of the memory unit on this machine? Put your answer in terms of XB where X represents one of the byte units like G is Giga. What is the byte unit for $260?$What are the dimensions of the memory $($in bytes$)$ assuming a square $2$D organization?