Your customer would like to enroll several hundred Nexus 6P devices as fully managed as quickly as possible. These devices run Android 6.0 out of the box. Which of the following enrollment methods would you recommend the customer use to complete provisioning as quickly as possible?

NFC provisioning is the most efficient method for quickly enrolling a large number of devices that are out-of-the-box Android 6.0. It allows for rapid, touch-to-provision setup without requiring manual input on each device. Zero-touch enrollment is ideal for new devices purchased from a reseller, but it requires prior setup with a reseller and Google, which isn't specified here and might not be "as quickly as possible" for existing stock. EMM Identifier is a manual entry method, which would be slow for hundreds of devices. QR code provisioning is also a viable option, but NFC is generally faster for bulk provisioning as it only requires a tap, whereas QR codes require scanning each device.