Which publishing strategy type is the following plan implementing? A company ran $3$ advertising messages, option a$,$ b$,$ and c$,$ randomly for first week and found option b was most effective. Starting from the $2$nd week this company ran option b for $50\%$ of its advertising campaign, option a for $25\%$ and option c for $25\%.$ From the $3$rd week and onward, it only ran option b$.$

Question $17$ options:

A$/$B testing

Bandit testing

Contextual bandit testing

Random selection

None of the above.