3. State different phases of executing an instruction. Briefly explain what operations take place in each phase. 4. Consider the following memory organization Addr Data (1 byte) 0x0 0x1 0x2 0x3 0x4 0x5 0x6 0x7 a. What is the addressability and address space of this memory? b. Assuming that the memory is Little Endian and is initialized with Os, what is the final content of the memory after storing the following multi-byte variable in the memory: int short var = 0x5678; assume &var -> 0x0;