List the Elements of the Set $\mathrm { A } \cap \mathrm { B }$

Multiple Choice

List the elements of the set.
-If A={7,8,9,12} and B={5,7,8,10} , list the elements of $\mathrm { A } \cap \mathrm { B }$

A) {5,7,8,9,10,12}
B) {7,8}
C) {5,9,10,12}
D) $\phi$