A task in a work queue has been viewed by a user in the advance_queue_processor role and the
user has closed the browser without closing the task properly. As a consequence, other users are
prevented from acquiring the task.
Which attribute of the dmi_workitem object needs to be cleared to release the lock?

A.
a_held_by

B.
r_performer_name

C.
r_ext_performer

D.
r_runtime_state