A Manufacturer Has Difficulty Hiring Qualified Engineers for Specialized Building

A manufacturer has difficulty hiring qualified engineers for specialized building projects.The pay and benefits are generous, but the supply of engineers with these specialized skills is small.The employer is trying to reach passive candidates.Which of these methods would be the least effective?

A) Search the hiring database for past applicants for the position.
B) Invite qualified engineers to a conference or social event.
C) Track potential candidates on social media or industry sites.
D) Provide a bonus to current employees with the same skills for referrals of qualified candidates.
E) Put the position on the manufacturer's website.