Step 1: Concept
External Sources of Recruitment.
Step 2: Meaning
When current staff lacks specific skills, companies seek candidates from the outside. One reliable method is to ask existing, trusted employees to vouch for qualified people they know.
Step 3: Analysis
• The company explicitly notes that existing staff lacks the skills, eliminating internal sources like Transfer (C) and Promotion (D).
• Direct Recruitment (A) involves placing a notice on the enterprise's bulletin board targeting casual callers or job seekers directly, not routing it through existing staff.
• The act of asking present employees to "introduce any friend or relative" perfectly describes the external source known as "Recommendation of employees" (or employee referrals).
Step 4: Conclusion
Sourcing candidates through the personal networks of the current workforce is identified as recommendation of employees.
Final Answer: (B)