What would be the recommended approach to help UC start immediately?

Universal Containers (UC) is facing data quality issues where Sales Reps are creating duplicate customer accounts, contacts, and leads. UC wants to fix this issue immediately by prompting users about a record that possibly exists in Salesforce. UC wants a report regarding duplicate records.

What would be the recommended approach to help UC start immediately?
A . Create an after insert and update trigger on the account, contact and lead, and send an error if a duplicate is found using a custom matchingcriteria.
B. Create a duplicate rule for account, lead, and contact, use standard matching rules for these objects, and set the action to report and alert for both creates and edits.
C. Create a duplicate rule for account, lead, and contact, use standardmatching rules for these objects, and set the action to block for both creates and edits.
D. Create a before insert and update trigger on account, contact, and lead, and send an error if a duplicate is found using a custom matching criteria.

Answer: B