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 I
D . Link-state routing protocols use SPF calculations that the tunnel endpoints leverage to implement the tunnel.
E . The tunnel endpoints use the link-state database to evaluate the entire topology and determine the best path.

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Answer: D