Which of the following is a step used to harden a database application?

Which of the following is a step used to harden a database application?

Disabling default accounts and changing passwords

Enabling all services

Disabling SQL

Disabling stored procedures 

EXPLANATION

Application hardening, which includes hardening database applications, consists of disabling default accounts and changing default passwords.
Application hardening includes disabling unnecessary services, not enabling all of them. You shouldn't disable SQL in a database application. Stored procedures increase performance, which can help prevent SQL injection attacks and shouldn't be disabled.