Account Posting Rules determine which general ledger account a transaction posts to based on the combination of worktags present, such as company, spend category, and cost center. Because a tenant can have multiple posting rules with varying numbers of conditions, Workday needs a deterministic method for choosing among them when more than one rule's conditions are satisfied by a transaction. The Official Workday Pro Procure-to-Pay Guide confirms that Workday selects the most specific applicable rule, meaning the rule with the greatest number of matching conditions or dimensions, ensuring that granular, targeted rules take precedence over broad, general ones. Option A is incorrect because ledger account determination in posting rules is automated and is not a manual selection made by the end user during transaction entry. Option B is incorrect because Workday does not simply read through all rules without a hierarchy; specificity, not sequence of review, governs selection. Option D is incorrect because relying on the first rule that merely meets conditions, regardless of how specific it is, could cause a broad rule to incorrectly override a more targeted one.