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Devices S1 and S2 have the interface configurations as shown in the exhibit. You attach ge-0/0/0 on S1 to ge-0/0/0 on S2. You attach ge-0/0/1 on S1 to ge-1/0/20 on S2. However, the ae0 interface remains down on both S1 and S2. What should you change to cause the ae0 interface to come up?