Which of the following postmortem planning techniques require the decedent to have executed, prior to death, a document that is enforceable after death?

An election that property in a QTIP trust qualify for the marital deduction

A Section $303$ stock redemption election

A disclaimer trust that will allow a surviving spouse to disclaim property and give her an interest in the property as a beneficiary of the trust

An election to waive personal representative $($executor$)$ fees