In the Karnaugh map shown below, which of the loops shown represent legal grouping? AB 00 01 11 10 -A 00 01 CD 11 C [1 D 10 1 1. In a 4-variable Karnaugh map, a 2-variable product term is produced by a) a 2-cell group of 1s b) an 8-cell group of 1s c) a 4-cell group of 1s d) a 4-cell group of Os An example of a product of sums (POS) expression is a) A(B + C) + AC' b) (A + B)(A' + B + C') c) A' + B' + C' d) Both a and c The Boolean expression X AB + CD can be realized in two-stage realization using a) two ORs ANDed together b) a 4-input AND gate c) two ANDS ORed together d) an exclusive OR