1Z0-032多項選擇題每日一練(2019.03.21)

You received this error message because Oracle Net Services cannot locate the connect descriptor specified in the tnsnames.ora configuration file：  
ORA_12154： TNS：could not resolve service name
Which three actions would be appropriate in helping to resolve the error？（）

What is true regarding the role Oracle Net provides in a client server connection with no middle tier？（）