Explanation
A formula field cannot be referenced by a roll-up summary field if it contains a cross-object field reference or a time-based function. A cross-object field reference is a reference to a field from a different object, such as Account. Name on a Contact object. A time-based function is a function that returns the current date or time, such as NOW() or TODAY(). Option A and C do not prevent a formula field from being referenced by a roll-up summary field.

Explanation
Workflow rule and an outbound message or Process Builder and Apex Code are two ways to integrate Salesforce with an external web service. Workflow rule can define criteria and actions for triggering an outbound message, which is an XML message sent to a designated endpoint URL. Process Builder can invoke Apex Code, which is a programming language that can make callouts to external web services using HTTP requests. Flow Builder and an outbound message or Process Builder and an outbound message are not possible combinations.

Explanation
The app builder would enable this ability in Chatter Settings. Chatter Settings is a setup menu that allows an app builder to configure various aspects of Chatter functionality, such as feeds, groups, email notifications, and more. One of the options in Chatter Settings is Enable Approvals via Chatter, which allows users to approve or reject requests from their team via Chatter posts or comments. Option A, B, and D are not places where an app builder would enable this ability.

Explanation
Launch a new approval process that has automatic submission enabled as an initial submission action, and Create a new approval process that has automatic submission enabled in the entry criteria. These are correct because both options allow the deals to be automatically submitted for approval without requiring any action from the sales rep. The automatic submission can be configured either as an initial submission action or as part of the entry criteria

Explanation
The solution that the app builder should configure to meet these requirements is creating three lead record types each with its own page layout containing the relevant fields. This way, the app builder can customize the fields and sections that appear on each record type based on the source of the lead. Option B is incorrect because creating a partner community and a record type for web and trade show leads does not address the requirement of collecting information that is unique to each type of lead, as partner community users may have different fields and layouts than internal users. Option C is incorrect because creating three sections on the lead layout and instructing users to collapse the non-relevant fields does not address the requirement of collecting information that is unique to each type of lead, as users may still see or enter data in the wrong fields. Option D is incorrect because creating custom page layouts for each type of lead only containing the relevant fields does not address the requirement of collecting information that is applicable to all sources, as users may miss some common fields.