Which three EL expressions, inserted at line 16, are valid and evaluate to "d"?

Given:

Which three EL expressions, inserted at line 16, are valid and evaluate to “d”? (Choose three.)

A.
${map.c}

B.
${map[c]}

C.
${map[“c”]}

D.
${map.map.b}

E.
${map[map.b]}

F.
${map.(map.b)}

Explanation: