It is my wish and my desire that he uses the income for the support of X and Y until both have attained the age of 18, at which time to distribute the principal of this gift to X and Y outright." Has a valid trust been created, why or why not?

a) Yes, as long as X and Y use the income for support
b) No, because the purpose is too vague
c) Yes, the language creates a valid trust
d) No, because it lacks a definite beneficiary