What is the range of values from which an ISP can assign a private AS number?

A.
32768 to 65535

B.
64512 to 65535

C.
65101 to 65535

D.
65001 to 65535

Explanation:

An autonomous system (AS) is a collection of networks under a single technical administration. Some other definitions refer to a collection of routers or IP prefixes, but in the end they all mean the same entity. The important principle is the technical administration, which means sharing the same routing protocol and routing policy. Legal and administrative ownership of the routers does not matter in terms of autonomous systems. Autonomous systems are identified by AS numbers, 16-bit unsigned quantities ranging from 1 to 65535. Public AS numbers are assigned by Internet registries. For customers that need AS numbers to run BGP in their private networks, a range of private AS numbers (64512 – 65535) has been reserved.
Reference: Configuring BGP on Cisco Routers volume 1 p.2-4