Linda described four triangles as shown below:

Triangle A: All sides have length 7 cm.

Triangle B: All angles measure 60°.

Triangle C: Two sides have length 8 cm, and the included angle measures 60°.

Triangle D: Base has length 8 cm, and base angles measure 55°.

Which triangle is not a unique triangle? (1 point)

Triangle A

Triangle B

Triangle C

Triangle D