3. (3 points) How does CUSP keep track of which words contain ASCII characters, which words contain instructions, and which words contain two's-complement numeric values? 4. (3 points) The designers of the CUSP simulator want to add a feature to operand instructions that allows individual bytes to be addressed, while still maintaining the 24-bit word size and a maximum of 4096 words. How many bits would have to be borrowed from the opcode field and added to the address field in an instruction to permit addressing of individual bytes? 5. (3 points) Why does the program counter use unsigned arithmetic while the accumulator uses two's-complement arithmetic?