When determining the human resources needs for a well-known engineering firm, the HR director realized that the company lacked a critical mass of engineers under the age of 30. The company could not afford to get caught short in this competitive business climate. An important recruitment strategy for the HR director's department was to start attending college fairs as well as considering hiring interns. We define his recruitment efforts as developing relationships with A) external sources B) median sources C) internal sources D) civilian sources