The following statements have been proposed for a cancer cell. A. Binding of p53 with MDM2, a ubiquitin E3 ligase, is a precondition for cancer progression. B. Phosphorylation of a tyrosine residue in the C-terminus of human c-src is essential for cell invasion and motility. C. Loss of function of both alleles of a tumor suppressor gene prevents metastasis. D.Dimerization of c-myc-Max leads to enhanced cell proliferation. Which of the combination of the above statements is correct? a)A and B b)C and D c)A and D d)B and C