Which of the following provides the BEST security and accountability for a Data Center?

Entry logging records events but does not actively control access or provide a physical security barrier.

Combination locks offer physical security but lack individual accountability, as the code can be shared among multiple users, making it difficult to track who entered at what time.

Card keys provide granular access control by allowing only authorized personnel with specific cards to enter, and they create an auditable log of who accessed the facility and when, ensuring accountability.

Dead bolts provide strong physical security but offer no inherent accountability or logging features for individual access.