Which change will definitely meet this requirement?

Managers want to ensure that every issue in Jira always has an assignee.

Which change will definitely meet this requirement?
A . Update post functions to set the assignee appropriately at each workflow transition.
B . Set Default Assignee to Project Lead in every project.
C . Use components for automatic assignment in every project.
D . Make the assignee required on workflow transition screens.
E . Make the assignee required through field configurations.
F . Set the global option “Allow unassigned issues” to OF

Answer: A

Explanation:

Reference: https://community.atlassian.com/t5/Answers-Developer-Questions/Conditional-Post-Function/ qaq-p/561594