The beta coefficient of a stock measures how a stock moves relative to given movements in the stock market which means that for a given move in the market the stock's price will move:

$$ a$.$ In the same direction $($up or down$)$ as the market and by the same magnitude

b$.$ In the same direction as the market if the coefficient is positively correlated to the market, and by the magnitude of the coefficient $q,$

c$.$ In the opposite direction as the market if the coefficient is negatively correlated to the marked and by the magnitude of the coefficient.

d$.$ Both b & c$.$

e$.$ None of the above