Why do Cisco MPLS TE tunnels require a link-state routing protocol?

Why do Cisco MPLS TE tunnels require a link-state routing protocol?

A. The link-state database provides segmentation by area, which improves the path-selection process. B. The link-state database provides a data repository from which the tunnel endpoints can dynamically select a source ID. C. Link-state routing protocols use SPF calculations that the tunnel endpoints leverage to implement the tunnel. D. The tunnel endpoints use the link-state database to evaluate the entire topology and determine the best path.