Solve the Problem $\{ \mathrm { m } \} , \{ \mathrm { n } \} , \varnothing$

Multiple Choice

Solve the problem.
-List all possible subsets of the set {m, n}.

A) $\{ \mathrm { m } \} , \{ \mathrm { n } \} , \varnothing$
B) $\{ \mathrm { m } \} , \{ \mathrm { n } \} , \{ \mathrm { m } , \mathrm { n } \} , \varnothing$
C) $\{ \mathrm { m } \} , \{ \mathrm { n } \} , \{ \mathrm { m } , \mathrm { n } \}$
D) $\{ \mathrm { m } \} , \{ \mathrm { n } \}$