Answer the following questions about the arm cortex m architecturea) what is the name of thebus that connects to program romb) what is the name of the bus that connects to ram and i/o? c) what is the size (in bits) of the processor? of the data bus? d) how many registers are in the register file? how many are general purpose? e) what name is given to the register that holds the condition code flags? f) what is the function of r15 (pc)? g) what is the starting and ending address for data ram in the kl25z128?