实验任务２用32*32的RAM实现寄存器堆，选出合适的存储器描述
选项：

A:localparam MEMDEPTH=1<<5 logic [31:0] mem [MEMDEPTH-1];
B:localparam MEMDEPTH=32; logic [31:0] mem [0:MEMDEPTH];;
C:localparam MEMDEPTH=1<<5 logic [4:0] mem [0:MEMDEPTH];
D:localparam MEMDEPTH=2**5; logic [4:0] mem [0:MEMDEPTH-1];