You have decided to organize a study group of other project managers in your organization to help prepare for the PMP exam．Everyone is highly motivated to earn the credential because the CEO has decided to pay a $5000 bonus to each person who becomes certified．What type of communication are you employing in your efforts to organize this group

A．Horizonta

B．Vertica

C．Forma

D．Externa

简述新形势下民兵建设的基本原则。