Designa 4-bit by 2-bit  binary multiplier. with full diagram adder

For the diagram shown and list included select which item in the list represents area O.(enter answer as a-q) BCD to 7 segment Decoder Flip Flop Encoder AC Line a. D C b. A F C. d. Seconds digit Comparator e. f. H. G H H MOD 10 g. h. 1 Hz reference i. 4 bit adder j. Oscillator J k. MOD 6 Hours digit Divide by 2 Synchronous counter Down Counter m. n. o. 0: N M: 60 Hz logic signal K р.

Briefly explain prefix byte

Please send me answer of a,b and c in details and i will give you like sure sir please.