Given the BinaryTree class (partially shown below) , select an expression to complete the static recursive helper method rightMostValue, which is designed to return the data value in the rightmost node of the tree rooted at node n. 
Definitions:
Exculpatory Clause
A contract term designed to release one of the parties from liability for harm or wrongdoing, transferring the risk to another party.
Enforceable
A term describing a legal agreement or contract that is valid and can be upheld and compelled by law or court order.
Unconscionable
Related to actions or conditions that are shockingly unfair, immoral, or unjust, often to the extent that they are unenforceable in court.
Liability
Legal responsibility or obligation to another party, often involving compensation for harm or damages incurred.
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