How many address lines are required for a memory containing a total at (a) 256 kB (b) 2 MB (c) 4 GB Fill in the blanks with one of IR, ALU, PC, ACC, MEMORY, FETCH PHASE or EXECUTE PHASE: (a) Data is stored in the __________ (b) Programs are stored in the ___________ (c) To be executed, an instruction is loaded into the ____________ (d) The address of an instruction to be executed is held in ______________ (e) Instructions are retrieved during the _________ (f) Instructions are interpreted during the ____________ (g) Arithmetic operations occur in the ____________ (h) Temporary intermediate results are held in the ____________