Which of the Following Statements Is True of Reciprocal Wills

Multiple Choice

Which of the following statements is true of reciprocal wills?

A) They can be held invalid as to one testator but not the other.
B) They are to be executed as one will with mutual terms.
C) Any will that is executed by two or more testators is a reciprocal will.
D) They cannot be unilaterally revoked after one of the parties has died.