Which statement about RNA processing in eukaryotes is INCORRECT?

A)Introns are simply excised out of pre-mRNA to produce the mature mRNA.
B)A protein/RNA complex is used to remove introns from the pre-mRNA.
C)A poly A tail is added on to the 3' end of the mRNA.
D)A 7-methylguanosine cap is added on to the 5'end of the mRNA.
E)Processing occurs in the nucleus.