All the following statements concerning the rule against perpetuities are correct EXCEPT

A. A will or trust instrument may contain a perpetuities savings clauseto eliminatepossible perpetuities problems.

B. The common-law rule provides that no interest in property is validunless theinterest must vest no later than 21 years plus 9 months after somelife orlives in being when the interest was created.

C. To determine whether the common-law rule is violated and thuswhether theinterest is invalid, it is necessary to wait until the interest actually vests.

D. The rule was enacted to prevent property from being held in trust indefinitely.