A SelectionMode determines which matched candidate(s) are chosen from an Exchange selection.
For example, if there is a pool of 10 work subscriptions, and a job is submitted which matches three of them,
the SelectionMode determines which of the three are selected.
Typically just the _best_ one of the list is chosen for some configurable meaning of _best_, though it could
select any number of work candidates.
A SelectionMode determines which matched candidate(s) are chosen from an Exchange selection.
For example, if there is a pool of 10 work subscriptions, and a job is submitted which matches three of them, the SelectionMode determines which of the three are selected.
Typically just the _best_ one of the list is chosen for some configurable meaning of _best_, though it could select any number of work candidates.