A pending Chatter post is a post that has been scheduled to be published at a future date and time. However, if the user who created the pending Chatter post is deactivated before the scheduled date and time, then the pending Chatter post will be canceled and will not be published. This is because deactivated users cannot create or edit posts in Chatter. Reference: https://help.salesforce.com/s/articleView?id=sf.collab_scheduled_posts.htm&type=5 https://help.salesforce.com/s/articleView?id=sf.collab_deactivated_users.htm&type=5

Validation rule is a tool that can be used to enforce data quality and business logic by preventing users from saving records that do not meet certain criteria. In this case, a validation rule can be created on the Lead object to display an error message if the Lead Status field is marked as qualified and the Budget field is blank. Reference: https://help.salesforce.com/s/articleView?id=sf.fields_about_validation_rules.htm&type=5

Field update and email alert are two types of automated actions that can be added as part of the approval process. Field update allows you to change the value of a field on a record when it is submitted, approved, rejected, or recalled. Email alert allows you to send an email to one or more recipients when a record is submitted, approved, rejected, or recalled.

Two reasons that would prevent a user from being deactivated are that the user is part of a territory hierarchy or that the user is assigned in workflow email alert. A territory hierarchy is a structure that defines how territories are related to each other in Salesforce; if a user is part of a territory hierarchy, they cannot be deactivated until they are removed from all territories. A workflow email alert is an action that sends an email to one or more recipients when a workflow rule is triggered; if a user is assigned in workflow email alert, they cannot be deactivated until they are removed from all email alerts. The user being in a custom hierarchy field or being the highest role in role hierarchy are not reasons that would prevent deactivation; they may affect data visibility or record ownership after deactivation, but they do not block deactivation itself. Reference: https://help.salesforce.com/s/articleView?id=sf.users_deactivate_considerations.htm&type=5

Chatter broadcast group is a type of group that should be created to meet this request. Chatter broadcast group is a group where only group owners and managers can create posts, but anyone can comment on posts. This can be useful for sharing important updates or announcements with a large audience without cluttering the feed with other posts. Reference: https://help.salesforce.com/s/articleView?id=sf.collab_groups_create.htm&type=5