Oracle Net Configuration Assistant is a post-installation tool that configures basic network components after installation. Which four components are included in the configuration？（）
A. Directory server
B. Hostname adaptor
C. TCP/IP host file
D. Connection Manager
E. connecting pooling
F. external procedures
G. listener names and protocol addresses
H. Net Service names in a tnsnames.ora file
I. naming methods the client uses to resolve connect identifier
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