In attempting to prove an identity, a student performed the following steps. Step 1 (sec 0 + 1)² = (sec0)² +1² 1 Step 2 (sec 0 + 1)² +1 2 cos e 1+ cos² 0 Step 3 (sec 0 + 1)² cos²0 sin² 0 Step 4 (sec 0+1)² = = cos² e Step 5 (sec 0+1)² = tan²0 = 9. The student's first error was made in step A. 1 B. 2 C. 3 D. 4

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