The Following Table Shows the Payoffs for Firm 1 and Firm

The following table shows the payoffs for Firm 1 and Firm 2 in a zero-sum game:
Table 10-6
$\begin{array}{c} \quad \quad \quad \text { Firm 2 }\\\begin{array}{ | c | c | c | } \hline \text { Firm 1 } & \text { C1 } & \text { C2 } \\\hline \text { R1 } & 4 & 2 \\\hline \text { R2 } & 0 & 6 \\\hline\end{array}\end{array}$
-Refer to Table 10-6. The equilibrium strategies for Firm 1 and 2 are:.

A) R1 versus C2.
B) (.5R1, .5R2) versus (.5C1, .5C2) .
C) (.75R1, .25R2) versus (.5C1, .5C2) .
D) (.5R1, .5R2) versus (.75C1, .25C2) .
E) The game is a constant-sum game.