What would not be true about a GNP beta?

Select one:

a. If a stock's b GNP = 1.5, the stock will experience a 1.5% increase for every 1% surprise increase in GNP.

b. If a stock's b GNP = -1.5, the stock will experience a 1.5% decrease for every 1% surprise increase in GNP.

c. It is a measure of risk.

d. It measures the impact of systematic risk associated with GNP.

e. None of the other answers.