Which is the second layer from the bottom in Open System Interconnection Reference Model? (71).(71) A ApplicationB Data linkC NetworkD Session请帮忙给出正确答案和分析,谢谢!
A (73) is a named memory block By using its name, we can refer to the data stored in the memory block (73)A wordB recordC programD variable请帮忙给出正确答案和分析,谢谢!