need only correct option

Given is the following combinatorial circuit. >1 b >1 Figure 6.1 Derive test pattern for the stuck-at-o fault at node b by application of the boolean difference for the combinatorial circuit shown in figure 6.1. Which of the following is the correct expression for the Boolean difference ab Whlen Sie eine Antwort: a. ab o O b. = ac + a ab o c. ab = ac o d. = ac + c ab O e. None of these is correct o f. =c ab o 9. = ac ab O h. = cb ab O i. = ac + ac ab O = bc ab O k. = 0 ab