Classify the given problem as either an optimization or a estimation problem.
The problem: Determine the most efficient route for a truck to deliver packages from city A to city B.
The given problem is an optimization problem.
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify the given problem as either an optimization or a estimation problem.

### Input:
The problem: Determine the most efficient route for a truck to deliver packages from city A to city B.

### Output:
The given problem is an optimization problem.