Which one of the following is NOT normally a conflict of interest that raises ethical concerns?

As a reviewer for a journal, reviewing a manuscript submitted by
      the researcher’s graduate student.
Providing privileged information to a company for whom the
      researcher is a paid consultant.
As a member of a review panel, reviewing a grant submitted by a
      person with whom the researcher has collaborated on publishing
      a book or article within a specified time period.
Getting paid for being an expert witness.