Which of the following statements is a valid polynomial identity?

Statement 1: x3 + 27 = (x + 3)(x2 − 3x + 9)
Statement 2: x3 + 27 = (x − 3)(x2 + 3x + 9)

a
Only statement 1 is valid.

b
Only statement 2 is valid.

c
Statement 1 and statement 2 are valid.

d
Statement 1 and statement 2 are invalid.