Student A: Two triangles are said to be congruent if two sides and an angle of one triangle are respectively equal to the two sides and an angle of the other. Student R: Two triangles are congruent if two sides and the included angle of one are equal to the corresponding two sides and included angle of the other. Given A & R, which of the following statements is correct?

• A. A is false and R is the correct explanation of A.
• B. A is true and R is the correct explanation of A.
• C. A is true and R is false.
• D. A is false and R is true.