Refer to the exhibit. In this design, which technology would provide for the best use of resources to provide end-to-end Layer 2 connectivity?

MSTP reduces the number of spanning tree instances but still blocks redundant ports, wasting available bandwidth and not maximizing resource utilization.

PAgP is Cisco's proprietary Port Aggregation Protocol for single-chassis EtherChannel negotiation only and cannot bundle links across multiple physical chassis.

Multichassis EtherChannel (such as Cisco vPC on Nexus or VSS on Catalyst) allows a downstream device to form an EtherChannel bundle across two separate upstream switches, ensuring all links are active and forwarding simultaneously. This provides end-to-end Layer 2 connectivity without STP blocking any member links, making full use of all available bandwidth while also providing redundancy at the chassis level.

LACP (IEEE 802.3ad) is an industry-standard port aggregation protocol but, like PAgP, only supports single-chassis EtherChannel and cannot span multiple physical switches.