When is a workplace label required? $($Read each answer and choose the best one.$)$

Question $9$ options:

A$)$

Any time the hazardous product is dispensed into a secondary container or when the supplier label becomes illegible. There are no exceptions.

B$)$

Only when the supplier label becomes illegible. There are no exceptions.

C$)$

When the product is dispensed into a secondary container or the supplier label becomes illegible, except when it will be under control of a single person in a single shift.

D$)$

Whenever the product is being used in a reaction vessel.