The correct answer is A.
UC has three Lead sources: web, trade shows, and partners. Some Lead information is common to all, while other fields are unique to each source. The best configuration is to use Lead record types with separate page layouts so each type of Lead shows the fields relevant to that process. Salesforce documentation states that record types allow different business processes, picklist values, and page layouts for different users or record categories.
B is not ideal because it leaves irrelevant fields visible and relies on users to collapse sections. C unnecessarily creates a different Lead object for the partner community. D is incorrect because separate custom objects would fragment Lead management and prevent standard Lead functionality from being used consistently.

The correct answer is A. Path.
Sales managers want reps to see recommendations, sales strategies, and key fields at each step of the Opportunity sales process. Salesforce Path is designed for exactly this. Path can highlight key fields and provide customized Guidance for Success for each stage of a process.
For Opportunities, Path can show reps which fields matter at each sales stage and provide stage-specific guidance such as qualification tips, sales strategy, or next-step recommendations.
C). Approval Process is for record approval routing.
D). Global Action is for creating or updating records quickly, not guiding users through sales stages.
B is not the correct Salesforce feature for this requirement.

The correct answers are B. Create a criteria-based sharing rule and C. Update the organization-wide defaults.
To move from a public sharing model to a more restrictive model, the app builder must first update the Organization-Wide Defaults for Accounts. OWDs define the baseline record access for users. Then, because the Sales team must still access all Account records with the Sales record type, the app builder should create a criteria-based sharing rule using record criteria, such as Record Type. Salesforce sharing rules are used to extend access when the OWD is Private or Public Read Only.
A is incorrect because owner-based sharing rules share records based on owner, not record type.
D is incorrect because profiles control object permissions, not record-level access by record type.

Use a Component visibility filter. The issue is not object access or field access. The Contact Lightning record page is shared, but one component should be hidden for users with the Marketing profile. Salesforce Lightning App Builder supports visibility filters on Lightning page components, so the app builder can conditionally show or hide that component based on user/profile criteria.
Why not the others? AppExchange is unrelated. Detail page layouts control field layout, not visibility of a Lightning page component. Field-level security controls field access, not whether a large component appears on a Lightning record page.

The correct answers are A. Public Groups, D. Roles and Subordinates, and E. Users.
For a custom object with Private sharing, manual sharing is used to open access to selected records on a case- by-case basis. Salesforce manual sharing allows individual records to be shared with users, public groups, and roles. Salesforce Classic manual sharing also lets the user select the type of group, user, role, or territory to add.
B). Private Groups is not the standard Platform App Builder answer here.
C). Permission Set Groups is incorrect because permission set groups grant permissions, not manual record- level sharing.