I would appreciate help with this question.

1.) Explain how UNIX permissions could be used to support shared access of files between the owner and the designated people in each scenario.

a.) How would you allow access to file1 for person1?

b.) How would you allow access to file1 for person1 and file2 for person2?

c.) How effective are Unix permissions for allowing shared file access? What is an alternative to using permissions?

Thank You