The correct answers are currentSprints() and nextSprints().

Both currentSprints() and nextSprints() are not defined JQL functions in Jira Software, so they are the names that are not valid for sprint-related queries. The sprint-related JQL features use specific functions to target sprint states and these two names do not appear in the documented set of sprint functions.

futureSprints() is a valid JQL function that finds issues in sprints that have not yet started, so it is not one of the invalid names.

openSprints() is a valid JQL function that returns sprints that are currently in progress, so it is not one of the invalid names.

closedSprints() is a valid JQL function that returns completed sprints, so it is not one of the invalid names.

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