A student simplified (the cube root of 27 − 12 ÷ 6)(7 − 9)2 using the following steps:

(the cube root of 27 − 12 ÷ 6)(7 − 9)2
Step 1: (3 − 12 ÷ 6)(7 − 9)2 Simplify the cube root.
Step 2: (−9 ÷ 6)(7 − 9)2 Subtract within first parentheses.
Step 3: −1.5(7 − 9)2 Divide within the first parentheses.
Step 4: −1.5(7 − 81) Simplify the exponent.
Step 5: −1.5(−74) Subtract within the parentheses.
Step 6: 111 Multiply.

Part A: The student made a mistake in Step 2. Describe the mistake and explain how to correct it. (3 points)
Part B: The student made a mistake in Step 4. Describe the mistake and explain how to correct it. (3 points)
Part C: Show every step of your work to simplify (the cube root of 27 − 12 ÷ 6)(7 − 9)2. (6 points)