9-1. For the counter program of Figure 10-4, the counter 9-1.

increments by one for each false-to-true transition of:

a) rung No. 1.

b) rung No. 2.

c) rung No. 3.

d) rung No. 4.

9-2. A preset count of 50 is selected when input ____ is closed. 9-2.

a) LS 1

b) A

c) B

d) C

9-3. For the light to come on after an accumulated count of 175: 9-3.

a) rung No. 3 must be true.

b) rungs No. 2, No. 3, and No. 4 must be true.

c) rungs No. 1, No. 2, and No. 6 must be true.

d) rungs No. 1, No. 2, No. 4, and No. 6 must be true.

Figure 10-4 Counter program for question 9.