Approve/Reject option in email EPBCS

Approval workflow has been enabled in EPBCS for a client based out of India. Requirement from client is to get an approval notification in email but with a approve or Reject option so that they will be able to approve or Reject accordingly without logging into the application. If that does not work, they would like to get an option of approval within the dashboard screen. They are not interested in toggling between different tabs for approvals as they does not want to have multiple clicks to get that done. Any suggestions ?