What is the author's attitude towards the" 10-minute cup of coffee" method

A．managers spend little time in talking to themselves.
B．managers often go to employees' offices and talk to them.
C．managers seize every chance to gather information from employees.
D．managers seldom spend time with customers and employees.

A．The necessity of spending time with customers has not been proved.
B．The advantages of spending time with customers are not obvious.
C．Managers may benefit a lot from pay a visit to their customers.
D．More and more managers begin to spend time with customers.