The psql interactive terminal uses meta-commands for administrative tasks. The command \list is used to display a list of all databases in the server cluster. \l is the officially documented shorter alias for \list. Both commands perform the identical function of querying the pgdatabase system catalog and presenting the results, which include the database name, owner, encoding, and access privileges. Therefore, both options A and B are correct.

A. This option is correct but incomplete because \l is also a valid and commonly used alias for the same command.

B. This option is correct but incomplete because \list is the full, unabbreviated form of the command.

C. \databases is not a recognized psql meta-command for listing databases.

1. PostgreSQL 16 Documentation. (2023). Chapter 35. psql, Section 35.5. Meta-Commands. The documentation table explicitly lists \l[+] [ pattern ] and \list[+] [ pattern ] together, indicating they are equivalent commands to "list databases". Available at: https://www.postgresql.org/docs/16/app-psql.html#PSQL-META-COMMANDS

2. Obe, R., & Hsu, L. (2021). PostgreSQL Up and Running: A Practical Guide to the Advanced Open Source Database (3rd ed.). O'Reilly Media. Chapter 2, "psql," details common meta-commands, noting that \l is the shortcut for \list.

3. University of California, Berkeley. (n.d.). CS 186: Introduction to Database Systems, Lab 1 - SQL. The course materials introduce students to PostgreSQL and psql, demonstrating the use of \l to list available databases as a fundamental administrative step.