A sales manager requested a report that contains the first name, last name, and phone...

A CROSS JOIN returns the Cartesian product of two tables, pairing every row from the first table with every row from the second, resulting in all possible combinations—including duplicates. This is useful when you need every record matched with every record, which aligns with the requirement to return all records, even duplicates.

CompTIA Data+ Reference:

CompTIA Data+ Study Guide (Exam DA0-001), Chapter 3: Databases and Data Sources, Section “SQL Joins and Their Use Cases”, Official CompTIA CertMaster Learn for Data+, Module 3.4 “Cross Joins and Data Output”.