Here is a table representing a relation named R: A B 0 1 2 3 4 5 6 7 8 Which of the following is NOT a true statement about relation R? (0,1,2) is a tuple of R. The schema of Ris R(A,B,C). (3,4,5) is a tuple of R. A is an attribute of R. O (A,B,C) is a tuple of R