Which of the Following Mechanisms Explain How Reovirus MRNAs Acquire

Which of the following mechanisms explain how reovirus mRNAs acquire their poly(A) tail?

A) They do not have poly(A) tails but use other sequences to functionally substitute.
B) Cellular enzymes add the poly(A) tail
C) Viral enzymes in the virion core add the poly(A) tail.
D) The encode a poly(A) tail in each genome segment.
E) The RNA polymerase stutters at a poly(U) region at the end of each genome segment.