Answer:
-Say nothing to his co-workers since this was a private conversation and he could lose his job if his boss found out he was spreading sensitive company information
Step-by-step explanation:
Since in the situation it is mentioned that Mark accidentally heard a confidential phone conversation in which the possibility of layoff in the sales division would be discussed he is not in danger but some of his friends are the sales representatives so mark would not tell anyone as it is a private conversation and he could lose the job if the boss knows that the information is spread by mark
Therefore the second option is correct