https://docs.servicenow.com/bundle/tokyo-servicenow-platform/page/administer/notification/task/t_CreateANotification.html Reference:
An Email Notification is a record that defines the content and conditions for sending an email message from the ServiceNow platform. The following are configured in an Email Notification:
Who will receive the notification. This is specified by the Recipients related list, which can include users, groups, email addresses, or scripts that return email addresses.
What content will be in the notification. This is specified by the Subject and Message HTML fields, which can include variables, scripts, or templates to dynamically generate the email content.
When to send the notification. This is specified by the When to send tab, which defines the conditions and events that trigger the email notification.
The following is not configured in an Email Notification:
How to send the notification. This is not a configuration option for an Email Notification. The platform uses the SMTP protocol to send email messages, and the email properties control the email server settings and behavior. References: Email Notifications, Get Started with Notifications

Comprehensive and Detailed Step-by-Step
Options for Creating Tables in Guided Application Creator:
Create a table from scratch: This option allows you to define a completely new table with custom fields and configurations.
Create a table from a template: You can use predefined table templates to speed up table creation. Templates often include pre-configured fields and settings.
Extend a table: This allows you to create a new table by inheriting fields and functionality from an existing table, enabling reuse and consistency.
Why Other Options Are Incorrect:
Option A (Link to external tables): Linking to external tables is not an option provided in the Guided Application Creator; external data is typically accessed through integration methods.
Option D (Run import jobs): Import jobs are used for data migration, not for table creation in the Guided Application Creator.
Option E (Upload a spreadsheet): While uploading a spreadsheet can create tables, this is a feature of Import Sets, not the Guided Application Creator.
Option F (Use API calls): API calls are for integration and not an option for creating tables directly in the Guided Application Creator.
Reference:
ServiceNow Developer Documentation on Guided Application Creator.

https://developer.servicenow.com/dev.do#!/learn/courses/sandiego/app_store_learnv2_learnmore_sandiego_learn_more/app_store_learnv2_learnmore_sandiego_form_and_list_layouts/app_store_learnv2_learnmore_sandiego_what_is_form_designer

One of the uses of the ServiceNow REST API Explorer is to create sample code for sending REST requests to ServiceNow. The REST API Explorer is a tool that allows you to discover and test the ServiceNow REST APIs. You can select an API endpoint, set the HTTP method, parameters, headers, and body, and then execute the request. The REST API Explorer will show you the response status, headers, and body, as well as generate sample code for various languages and frameworks, such as cURL, Java, JavaScript, Node.js, Python, Ruby, and more. References: [Use the REST API Explorer - Product Documentation: Tokyo - ServiceNow],
[Introduction to Scripted REST APIs - ServiceNow Developers]