How many of the following statements must be true? I. Uncertainty B has been observed at the time of Decision D. II. Uncertainty B has been observed at the time of Decision E. TIT. Uncertainty A has...

How many of the following statements must be true?

I. Uncertainty B has been observed at the time of Decision D.

II. Uncertainty B has been observed at the time of Decision E.

TIT. Uncertainty A has been observed at the time of Decision E.

IV. Uncertainty C has been observed at the time of Decision E.

a. 0 or 4

b. 1

c. 2

d. 3