If a Competitor Wants to Cause Damage to Your Organization

If a competitor wants to cause damage to your organization, steal critical secrets, or put you out of business, they just have to find a job opening, prepare someone to pass the interview, have that person hired, and they will be in the organization. How would you prevent such type of attacks?

A) Conduct thorough background checks before you engage them
B) Hire the people through third-party job agencies who will vet them for you
C) Investigate their social networking profiles
D) It is impossible to block these attacks