Which statement is true about Enterprise Manager (EM) express in Oracle Database 12c?

EM Express is not available by default after database creation - an administrator must first configure the HTTPS port using DBMS_XDB_CONFIG.SETHTTPSPORT before the interface is accessible.

EM Express is scoped to a single database instance - each database has its own separate EM Express interface and there is no built-in capability to manage multiple databases from one console.

While a PDB-level EM Express can be accessed by connecting directly to a PDB, not all basic administrative tasks for pluggable databases are available from the CDB root-level EM Express interface.

EM Express runs via an embedded HTTP server inside the database instance itself, so it cannot perform instance-level lifecycle operations like startup or shutdown - those require SQL*Plus, DBCA, or Oracle Enterprise Manager Cloud Control.

EM Express does not support creating or configuring pluggable databases - PDB lifecycle management requires SQL commands, DBCA, or Oracle Enterprise Manager Cloud Control.