Explanation
A: A stop word is a certain term that you don't want to be used in the scoring of all search results.
D: A meta-answer is a collection of related answers that are all associated with the same products and categories. These related answers are called sibling answers, and that relationship is defined on the CX Console, not on the accessibility interface.
References:
https://www.oracle.com/assets/knowledgebase-search-effectiveness-1607920.pdf

Explanation
In order for answers to appear on the customer portal, the Status, Access Level, Language, Product,and Category fields must be set to a visibility that allows access by customers. If even one field does not allow visibility, the answer will not be available on the customer portal.
C: The primary factor that determines the visibility of answers is answer status. There can be many custom answer statuses, but all must be either a Public or Private status type, which is determined when the custom status is created.
F: Products and categories-The visibility settings for the products and categoriesassociated with the answer will also affect the visibility. If the answer is assigned to a product or category that is not visible to customers on a particular interface, the answer will also not be visible to customers, unless it is assigned to another product or category that is visible on the interface. In other words, if you have an answer that is assigned to two products, and one of the products is not visible on the interface, but the other product is, your answer will appear on the interface. However, if the answer is assigned to two products, and neither product is visible on the interface, your answer will not appear on the interface under any circumstances.
References:
https://docs.oracle.com/cloud/november2016/servicecs_gs/FAABU/_BUIGuide-9.htm

Explanation
20MB is the maximum as well as the default.
References:
http://communities.rightnow.com/posts/7e961ac4d6?commentId=46204#46204

Explanation
D: CRUD operations on Sub-Objects are done only via their parent object E: Primary objects have their own life cycle.Primary objects are objects with a unique ID (primary key) which can be directly created, read, updated, and deleted. All primary objects inherit from the RightNow RNObject.
Primary objects have no set lifecycle in the Oracle RightNow Cx platform, meaning that once the objects are created, they exist in the system until they are deleted.

Explanation
Answer variables are predefined shortcuts for entering information into an answer instead of a long string of text. When an answer displays on the customer portal, the variable is replaced with whatever value was specified by your administrator.
Variables are also helpful to use for information that may change. When your administrator changes the value of the variable, all answers containing that variable will also change. Contact your administrator for a list of variables defined for your application. For example, if your administrator added a variable for a support email address at your organization called "contact," you could insert the variable for the email address in the answer, such as $contact. If the email address changes, all answers containing the contact variable are updated.
References:
https://docs.oracle.com/cloud/november2016/servicecs_gs/FAABU/_BUIGuide-9.htm