Ryan's dad needs to drive bigger company vehicles in order to get promoted. what does he need?

A Commercial Driver License

Explanation:

When a person or an individual, who needs to drive the bigger vehicles of the company, that person or an individual needs or require to have a commercial driver license, which make the person authorize to drive the car. As the law, states, that the person should have a commercial license.

Therefore, Ryan's dad, who wanted to be get promoted, he needs to drive the bigger vehicles of the company, for that he needs or require the driver license and it is to be commercial one.

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