以下有关人力资本投资的表述错误的是（）

A．投资主体可以是国家或个人

B．投资对象是人

C．投资直接提高人的劳动生产能力

D．是一种非生产性投资

Communication protocols are (66) connection-oriented or connectionless, (67) whether the sender of a message needs to contact and maintain a dialog with the recipient or (68) send a message without any, prior connect and with the hope that the recipient receives everything. (69) .These methods (70) the two ways that communication is implemented on networks.

A．not

B．neither

C．either

D．all