Answer
True.
Work Step by Step
A differential equation of order $n$ is expected to have $n$ arbitrary constants. This equation is a third order differential equation, so there must be three arbitrary constants.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.