Which technology must be configured to prevent remote sites from getting overwhelmed with traffic and prevent packet drops from the headquarters?

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A company has their headquarters located in a large city with a T3 frame relay link that connects 30 remote locations that each have T1 frame relay connections.

Which technology must be configured to prevent remote sites from getting overwhelmed with traffic and prevent packet drops from the headquarters?
A . traffic shaping
B . IPsec VPN
C . GRE VPN
D . MPLS

Answer: A