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 the senice 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 and supervision

D$.$ Personnel requirements in $1B$ are about the same. regardless of whether the firm deals in goods or services