Consider the following SQL command to store encrypted data in a PostgreSQL database using pgcrypto:CREATE EXTENSION IF NOT EXISTS pgcrypto;INSERT INTO documents $($doc$\_$id$,$ content$)$ VALUES $(1,$ PgP$\_$sym$\_$encrypt$(\text{'}$confidential document content', $\text{'}$my$\_$secret$\_$key'$))$:What does this command achieve? It encrypts the 'confidential document content' with the key $\text{'}$my$\_$secret$\_$key' before storing it in the database. It securely stores the document content in an unencrypted format for performance optimization.It generates a digital signature for the document content to ensure its integrity. It creates a new PostgreSQL extension that will compress document contents.