Your Company Works Regularly with a Partner

Your company works regularly with a partner. Your employees regularly send emails to your partner's employees. You want to ensure that the Partner contact information available to your employees will allow them to easily select Partner names and reduce sending errors. What should you do?

A) Educate users on creating personal contacts for the Partner Employees.
B) Add a secondary domain for the Partner Company and create user entries for each Partner user.
C) Create shared contacts in the Directory using the Directory API.
D) Create shared contacts in the Directory using the Domain Shared Contacts API.