What Is a Disadvantage of the "Prepaid College Tuition Plan

What is a disadvantage of the "Prepaid College Tuition Plan" version of the 529 plan?

A) Distributions before age 59 1/2 incur a 10% tax penalty.
B) They generally guarantee that your child will be covered only if he or she attends a public in-state university or college.
C) They allow greater flexibility than the College Savings Plans.
D) All of the above.
E) None of the above.