Which command is used for installing packages from the command line on Ubuntu?

Which of the following is NOT a problem of working with flat files in PHP?

a. Searching for a particular record is difficult b. When a file becomes small, working with it can be very slow c. Dealing with concurrent access can become problematic d. All file processing is sequential

To delete a cookie, you change the ____ property.

A. domain B. expires C. path D. secure