What Is the Function of the Dot Operator

What is the function of the dot operator?

A) It serves to separate the integer portion from the fractional portion of a floating point number
B) It allows one to access the data within an object when given a reference to the object
C) It allows one to invoke a method within an object when given a reference to the object
D) It is used to terminate commands (much as a period terminates a sentence in English)
E) Both B and C are correct