(?G ? E) • (R ? M) $\frac{R \vee \sim \mathrm{G}}{\mathrm{E} \vee \mathrm{M}}$

Multiple Choice

(?G ? E) • (R ? M) $\frac{R \vee \sim \mathrm{G}}{\mathrm{E} \vee \mathrm{M}}$

A) MT-valid.
B) Invalid.
C) DA-invalid.
D) MP-valid.
E) AC-invalid.