Which statement correctly describes how MTU mismatches are addressed in the IS-IS neighbor-formation process?
A . IS-IS checks the locally configured MTU against the MTU advertised in neighbor hello packets.
B . IS-IS checks the locally configured MTU against the MTU advertised in neighbor LSPs.
C . IS-IS does not check for MTU mismatches when forming a neighbor relationship.
D . IS-IS pads hellos, so neighbor relationships will not be formed on links with mismatched MTUs.
Answer: D