Bob and Alice are typical users who share a computer. Which of the following is true of a user isolation policy? Assume no tailoring takes place.

Alice can read and write application files.

Bob and Alice can read files that others can't read.

Bob can read Alice's files.

Bob can modify Alice's files.

Bob can create, read, and modify his own files.

Bob and Alice can share files $($read and write$)$ that others can't read.