a unit of code written in C

Match the following external C procedure components with their descriptions:
1. External procedure a. a process that starts the extproc process
2. Shared library b. a session-specific process that executes the external procedure
3. Alias library c. schema object that represents the operating system (OS) shared library

4. The extproc process d. operating system file that stores the external procedure
5. Listener process e. a unit of code written in C

A.
1-e; 2-d; 3-c; 4-b; 5-a

B.
1-c; 2-d; 3-e; 4-b; 5-a

C.
1-e; 2-c; 3-d; 4-b; 5-a

D.
1-a; 2-d; 3-e; 4-c; 5-b