An engineer is allocating a determined amount of bandwidth to a customer Cisco MPLS TE tunnel to guarantee its availability on a 24/7 SLA type. Which option must be configured to make sure the customer is able to use the bandwidth agreed on the SLA?

A.	RSVP that guarantees bandwidth availability end-to-end
B.	Cisco MPLS TE tunnel to signal the bandwidth required
C.	a QoS policy to reinforce the RSVP bandwidth reservation
D.	overprovisioning to guarantee bandwidth