we can construct a full adder with two half adders.（）

r feture of the feudl system of Englnd ws thtll lndowners took the oth ofllegince to______.their immedite lord B．the king C．either their immedite lord or king D．their immedite lordnd the kings wellA．their immediate lordB．the kingC．either their immediate lord or kingD．their immediate lord and the king as well