Each of P, Q, R, S, T, U and V has an exam on a different day of the week starting from Monday and ending on Sunday of the same week. Q answers the exam immediately before T. T answers the exam immediately before P. P answers an exam on Wednesday. R does not answer the exam on Saturday or Sunday. U answers the exam on Friday. S answers the exam immediately after U. Who answers the exam on Sunday?
AU
BV
CT
DQ