Clients in treatment are separated into two sub-groups. One-half the client group is given one form of a test instrument, and the other half is given an alternative form of the same test. The Pearson r correlation between the scores from the two groups is 0. 96. This indicates that the two forms of the test instrument have:
a. High alternative form validity
b. Low alternative form reliability
c. High alternative form reliability
d. Low alternative form validity