The question asks which arithmetic operator has the highest precedence among division ($/$), multiplication ($*$), modulo (mod), and exponentiation ($**$).

1. Problem Description

The question asks which arithmetic operator has the highest precedence among division ($/$), multiplication ($*$), modulo (mod), and exponentiation ($**$).

2. Solution Steps

The order of operations, often remembered by the acronym PEMDAS (Parentheses, Exponents, Multiplication and Division, Addition and Subtraction), dictates the precedence of arithmetic operators. Some programming languages use similar rules, but details may vary.

In most languages:

1. Parentheses are evaluated first.

2. Exponentiation has the next highest precedence.

3. Multiplication and division have equal precedence and are evaluated from left to right.

4. Addition and subtraction have equal precedence and are evaluated from left to right.

5. Modulo typically has the same precedence as multiplication and division.

Therefore, exponentiation ($**$) has the highest precedence.

3. Final Answer

The arithmetic operator with the highest precedence is **.