1. [40 points] We have the following C code: A[6] = B[5] - 7; Assuming the base address of array A in memory is stored in register x25, the base address of array B in memory is stored in register x26, and the memory is byte addressed, please convert the C code to the following lower-level code: (a) RISC-V assembly code (Hint: There should be 3 lines of assembly code); for each line of assembly code, please write a brief comment (using "/") to explain what the code is doing. (b) Machine code in binary (Hint: There should be 3 lines of machine code, one for each line of assembly code); for each line of machine code, please briefly explain which RISC-V instruction format you used to do the instruction encoding (Note: You do not need to present the details of the format but just tell which format it is.)