Which test Can quickly identify the CORE Link causing the problem?

A service provider NOC engineer received numerous support tickets from their VPN Customer are connected to two PE routers. The NOC Engineer created a VRF TEMP to run tests between these 2 PEs routers and no error were received. ECMP is between P and PE routers. Which test Can quickly identify the CORE Link causing the problem?
A. An MPLS traceroute with multtipath option between the PEs loopback
B. And extended ping with multipath option between PEs loopback
C. A vrf Ping between customer CE Router and SP remote PE router
D. Vrf trace route between customer CE router and SP remote PE router
E. An MPLS ping with sweep option between the PE loopback

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