To enable contactless payment, NFC (Near Field Communication) (Option C) needs to be enabled. NFC is the technology used in most mobile payment systems to enable close-range communication between the phone and a payment terminal. Wi-Fi (Option A) and Bluetooth (Option D) are unrelated to contactless payments. Nearby share (Option B) is a file-sharing feature, not a payment technology. CompTIA A+ Core 2 Reference: 2.7 - Explain common mobile device security settings, including enabling NFC for mobile payments.