TCP/IP ( )layer protocols provide services to the application( )running on a computer. The application layer does not define the application itself, but rather it defines( )that applications need--like the ability to transfer a file in the case of HTTP. In short, the application layer provides an( )between software running on a computer and the network itself. The TCP/IP application layer includes a relatively large number of protocols, with HTTP being only one of those. The TCP/IP(请作答此空)layer consists of two main protocol options--the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP). A.application B.session C.physical D.transport