Gary is a freelance network analyst. A client approaches him to provide a solution for his firm wherein employees have been found to carry sensitive information out of the office premises. This data breach has led to a lot of market speculations because of which there has been a significant drop in the share market prices of the company's stocks. Gary is contracted to find a solution to this issue. Analyze which one of the following options should be carried out by Gary keeping in mind the sensitivity of the situation.

a.Deploy a DLP (Data Loss Prevention) solution

b.Enforce the principle of least privilege

c.Maintain checks and balances on employee's behavior

d.Provide social engineering awareness training