While swapping 2 numbers what precautions to be taken care?

b = (b / a);
a = a * b;
b = a / b;

A. Declare a variable B. Declare a function C. Define a function D. Assign a value

A. . B. ; C. : D. ,

A. char B. int C. float D. double

A. int variable_name; B. variable_name = 5; C. variable_name int; D. int = variable_name;