Explanation
You can create a chart in an interactive grid by selecting Chart in the Actions menu. You can only create one chart at a time in an interactive grid. To create a second chart, you have to reconfigure or delete the existing chart1. To remove a chart, you can click the Remove Chart icon (X) adjacent to the chart filter12. Once a chart is created, you can switch the view between Grid and Chart by clicking the toggle that appears at the top of the interactive grid

Explanation
In Oracle APEX, you can choose from different authentication methods to establish a user's identity and control access to your application. Authentication may require a user to provide some type of credentials, such as a user name and password, or could involve the use of digital certificates or a secure key. Three of the authentication methods that you can choose in Oracle APEX are:
Custom Authentication Scheme: This method allows you to create your own authentication logic using PL/SQL code or an external web service. You can also customize the login page and session management for your application.
No Authentication (using DAD): This method adopts the current database user as the authenticated user.
This approach can be used in combination with a mod_plsql Database Access Descriptor (DAD) configuration that uses basic authentication to set the database session user.
Built-in Authentication Scheme: This method allows you to use one of the preconfigured authentication schemes that ship with Oracle APEX, such as Open Door Credentials, LDAP Directory, Social Sign-In, and so on.

Explanation
A drill down master detail form allows you to create a master detail form that contains two pages based on two related tables or views. The first page contains an interactive report for the master table. The second page features a standard form for the master and interactive grids for the detail. You can use the Create Page wizard to create a drill down master detail form. References: Creating Master Detail Forms and [Creating a Drill Down Master Detail Form]

Explanation
A REST Data Source is a logical representation of an external web service in Oracle APEX. It can contain one or many Operations, which are the references to a concrete external web service endpoint. Oracle APEX supports three types of REST Data Sources: REST Enabled SQL Query, Web Source Module, and Generic REST Data Source. Oracle APEX provides direct integration of REST Data Sources in interactive reports and grids, as well as other components. REST Data Sources can support various authentication methods, such as Basic, OAuth2, or Custom. References: [Understanding REST Data Sources] and [Creating a REST Data Source]

Explanation
APEX automation is a feature that allows you to automate tasks such as data loading, data synchronization, application export and import, and REST API calls by using declarative actions or PL/SQL code blocks. You can create automation tasks by using the Database Actions interface or by using the APEX_AUTOMATION package. To log messages to the execution log in APEX automation, you can use the APEX_DEBUG package with any of its logging levels (info, warning, error, etc.). The other options are not valid methods of logging messages in APEX automation. Verified References: [Using APEX Automation - Oracle Help Center],
[APEX_DEBUG - Oracle Help Center]