How should an international service firm approach human resources?

A$.$ The personnel should be tightly controlled, with a high degree of standardization in terms of words and actions

B$.$ As personnel necessarily comes and goes, only a brief introductory training should be provided, freeing more resources to improving service process itself

C$.$ Due to the close interaction with the customer, the personnel need to be afforded a great deal of trust, supplemented with training supervision

D$.$ Personnel requirements in IB are about the same, regardless of whether the firm deals in goods or services