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Question:

Which of the following actions are optional when you change lanes?

A None of the above
Explaination

Before you change lanes, you must signal and check your mirrors. However, your car has blind spots that are large enough to hide another car in the lane next to yours. The only way to check those blind spots is to look over your shoulder before you change lanes. [Scanning, Seeing Well, Safe Driving Tips, South Dakota Driver License Manual]