Which of these components does LACP use to create the system ID?

A network designer is working with a company to improve convergence at the Layer 2 control plane and
decides to use LACP. Which of these components does LACP use to create the system ID?
A. LACP system priority and switch MAC address
B. LACP port priority and switch MAC address
C. LACP port priority and port number
D. LACP system priority and port number

Answer: A