What options does the business user have to manually share individual records?

A new custom object is being created with a private sharing setting. The business wants to share individual records with specific people or group of people on a case by case basis .

What options does the business user have to manually share individual records? Choose 3 answers
A . Public Groups
B . Permission Sets
C . Roles
D . Profiles
E . Users

Answer: A,C,E