Cindy intends to distribute contactless cards to facilitate access to the buildings under her protection. Which of the following technologies should she implement?

Cindy should utilize Radio Frequency Identifier (RFID) cards, which are readable through contactless readers. RFID technology is widespread and cost-effective, but it only verifies possession of a card, and additional authentication is necessary to establish whether someone has the authorization to access a building or room. Wi-Fi is not employed for contactless cards due to its power consumption and overhead. Magstripes demand a reader instead of being contactless, and HOTP is a one-time password system.