Mating spur gear teeth

Question

1. For the given statements.

1. Mating spur gear teeth is an example of higher pair
2. A revoute joint is an example of lower pair.

Indicate the correct answer                                              

      (a) Both I and II are false

      (b) I is true and II is false

      (c) I is false and II is true

      (d) Both I and II are true