I need a right answer for this question.

Question

Q. There are 2 record types, ABC and XYZ, which sync enabled. The XYZ record type is added as a relationship into the ABC record type. A user has Viewer permission to the ABC record type but does not have access to the XYZ record type. A site page is represented to the user where the data is sourced from the ABC record type and its related record type the XYZ reference. What information does the user see on the site page? 
 
 Page is presented to the user and the data reference to the XYZ record type appear as &ldquo;null&rdquo; 
 Page is presented to the user with the XYZ record type data and field references redacted. 
 Page does not load, and an error message is presented: &ldquo;The record type [identifier=XYZ] does not exist, has been deleted, or you do not have sufficient privileges to access the data.&rdquo;

Harsha Sharma · Answer

If the Source is ABC Record then correct answer is option 1. User will see data from ABC record and wherever data reference is done using XYZ the data will be blank or null. 
 The page will error out only when user attempts to access page where XYZ record is the source.

Shubham Aware · Answer

Option 1

If you do not have sufficient permissions on the related record type, you cannot reference the related record fields, and any references to the related record fields will appear as null.

https://docs.appian.com/suite/help/25.3/record-security.html#_