A.Roll-up Summary Field

B.Workflow Rule

C.Apex Code

D.Process Builder

A.Campaign hierarchies follow validation rules.

B.Salesforce runs validation rules before creating records submitted via Web-to-Lead and Web-to-Case, and only creates records that have valid values.

C.Validation rules are only enforced during lead conversion if "validation and triggers for lead conversion" are enabled in your organization.

D.When one validation rule fails, Salesforce continues to check any additional validation rules on that field or any other field on the page and displays all appropriate error messages at once.

A.Data can be lost when converting from simple picklist to multi picklist.

B.Information can be lost when converting from text area (rich) to text area (long).

C.Data can be lost converting from number to currency (assuming that field lengths are identical).

D.Data can be lost when converting from auto-number to text.

A.Unmanaged Packages

B.Force.com Migration Tool

C.Changes Sets

D.Force.com IDE

A.Profiles

B.Permission Sets

C.Roles

D.Public Groups