Which Position of the Anticodon Is Called the Wobble Base

Which position of the anticodon is called the wobble base and with which base of the codon does it pair?

A) the 3' anticodon base which pairs with the first base of the codon
B) the 3' anticodon base which pairs with the last base of the codon
C) the middle anticodon base which pairs with the middle base of the codon
D) the 5' anticodon base which pairs with the first base of the codon
E) the 5' anticodon base which pairs with the last base of the codon