The Upper Bound at the Initial Node of a Branch

Multiple Choice

The upper bound at the initial node of a branch and bound tree is given by

A) the value of the objective function of the LP relaxation .
B) the value of the objective function after the LP relaxation solution is rounded down to an integer solution.
C) the value of the objective function corresponding to an integer feasible solution determined on the basis of trial and error.
D) cannot be determined