When we will close a bug. give four reasons?

When we will close a bug. give four reasons?]

Following are the four reasons:

  1. Bug is not reproducible

  2. Bug is resolved

  3. If resolved bug, do not have any bad impact on the other functionality of a project

  4. Works fine on all the browsers (e.g. IE versions - if bug is related to java script it generally does not works on IE7,IE8)