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In which of these multi-stage rockets are the stages arranged alongside one another?

In which of these multi-stage rockets are the stages arranged alongside one another? Correct Answer Parallel stage

Staging in a rocket is essential to obtain the delta-v required to escape the Earth’s atmosphere. When the stages are arranged alongside each other it is known as parallel staging. The propellants are burned at the same time and has an advantage of getting rid of propellant mass quickly thus resulting in higher acceleration and delta-v.

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