Which opinion type serves to express agreement but offers different rationale?

The choice indicating concurring opinion is accurate because a concurring opinion is written by one or more justices who agree with the majority's conclusion in a case but wish to express different reasons or justifications for that conclusion. This type of opinion allows justices to articulate their unique perspectives, even when they arrive at the same judgment as the majority.

In contrast, a majority opinion sets forth the official ruling of the court and is supported by the majority of justices. Dissenting opinions represent those who disagree with the majority's decision and outline the reasons for that disagreement. A judicial opinion is a general term that refers to any opinion issued by a court, without specifying whether it is majority, concurring, or dissenting. Hence, the characteristic of the concurring opinion is its role in affirming the outcome while diverging in reasoning, making it the correct answer.