Which of the following statements is true with regard to the deduction for charitable contributions?

Group of answer choices

Charitable contributions disallowed due to the 50% of AGI limitation can be carried forward indefinitely.

A canceled check is sufficient documentation for a cash contribution of $500 to a charity.

An attorney who provides free legal advice to a qualified charitable organization can deduct the fair market value of his services.

Taxpayers may be able to deduct the fair market value of stock given to a qualified charitable organization.