In the context of the Rule Against Perpetuities (RAP), what must one determine regarding the measuring person?

In the context of the Rule Against Perpetuities, it is essential to determine whether the measuring person is deceased before any interest vests. The Rule Against Perpetuities aims to prevent interests in property from being tied up indefinitely, and it specifically addresses future interests that may not vest within a certain timeframe.

Under the rule, an interest is valid only if it is certain to vest or fail within the lifetime of a person who is identifiable at the time the interest is created, plus 21 years. This identifiable person, often referred to as the "measuring life," must be alive when the interest is created for it to be valid. Therefore, establishing the status of this person—whether they are still alive or have passed away—is crucial in determining the validity of the property interest in question.

The other options, while they might touch on relevant aspects of property law or interests, do not directly relate to the critical requirement of the Rule Against Perpetuities concerning the vesting of interests and the timing centered around the measuring person's lifespan.