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
