A summary report with a cross-filter is a type of report that allows you to summarize data by grouping rows and columns and applying filters based on related objects and fields. A cross-filter is a filter that lets you include or exclude records in your report based on related objects and their fields. In this case, you can create a summary report that includes a cross-filter to the Account object with a sub-filter for credit card number equal to null. This will show you all B2C accounts that are missing the credit card number, regardless of whether it is encrypted or not. Reference: https://help.salesforce.com/s/articleView?id=sf.reports_summary_charts.htm&type=5 https://help.salesforce.com/s/articleView?id=sf.reports_cross_filters.htm&type=5

A cross-filter lets you filter records based on related objects and their fields. For example, you can filter accounts that have at least one opportunity from this year and at least one completed activity in the last 30 days. Reference: https://help.salesforce.com/s/articleView?id=sf.reports_cross_filters.htm&type=5

Modify All is the level of access that the sales user will have on the Account object after being assigned to a muting permission set that mutes Delete access on Account. Muting permissions are a way to reduce or remove access to objects or fields for users who are assigned to permission set groups. Muting permissions can only mute object-level permissions, such as Create, Read, Edit, Delete, View All, or Modify All, but not field-level permissions or other permissions. Muting permissions can only reduce or remove access that is granted by other permission sets or permission set groups within the same permission set group, but not by profiles or other sources of access. Therefore, in this case, the muting permission set will only mute the Delete access on Account that is granted by the permission set group, but not the Modify All access that is also granted by the permission set group.

A junction object is a custom object that has two master-detail relationships with two other objects. A junction object allows administrators to create many-to-many relationships between objects, such as relating multiple accounts to multiple regions.
To create a junction object called Account Region to link the standard Account object with a custom object called Region, an administrator needs to do the following steps:
A) Make a master-detail relationship field on the junction object to the Region object.
A master-detail relationship field is a field that links a child record to a parent record. The child record inherits the sharing and security settings of the parent record. By making a master-detail relationship field on the junction object to the Region object, an administrator can link each Account Region record to one Region record and make Region the first master of the junction object. Reference: https://help.salesforce.com/s/articleView?id=sf.relationships_considerations.htm&type=5 D) Configure a master-detail relationship field on the junction object to the Account object.
By configuring a master-detail relationship field on the junction object to the Account object, an administrator can link each Account Region record to one Account record and make Account the second master of the junction object. This allows administrators to relate multiple accounts to multiple regions through the junction object. Reference: https://help.salesforce.com/s/articleView?id=sf.relationships_considerations.htm&type=5