The correct answers are filter = "SkillUp" AND resolution is EMPTY, filter = SkillUp AND resolution = EMPTY and filter = 'SkillUp' AND resolution is EMPTY.

All three of these use a saved filter and then narrow that set to issues with an empty resolution using the EMPTY keyword. Quoting the filter name with double quotes single quotes or leaving it unquoted are all acceptable depending on whether the name contains spaces. The important part is combining the saved filter with resolution is EMPTY or resolution = EMPTY so only unresolved issues from that saved filter are returned.

filter = SkillUp OR resolution is EMPTY is incorrect because it uses OR and that will return any issue that has no resolution as well as all issues in the saved filter. That broadens the result set beyond issues that are both in the saved filter and unresolved.

filter = 'SkillUp' AND resolution equals EMPTY is incorrect because JQL does not use the word equals as an operator. You must use = or is with the EMPTY keyword in JQL.

filter = "SkillUp" AND resolution is NULL is incorrect because NULL is not the JQL keyword for an empty field. The correct keyword to test for no value in the resolution field is EMPTY.

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