What is the factored form of 343 + x^6?
A.(7 - x)(49 + 7x + x^2)
B.(7 + x)(49 – 7x + x^2)
C.(7 - x)(49 + 7x^2 + x^4)
D. (7+ x2)(49 - 7x^2 + x^4)
