What is the completely factored form of p4 – 16? (p – 2)(p – 2)(p + 2)(p + 2) (p – 2)(p – 2)(p – 2)(p – 2) (p minus 2) (p + 2) (p squared + 2 p + 4) (p minus 2) (p + 2) (p squared + 4)