Arrange the following methods from MOST SAFE to LEAST SAFE a…

Arrange the following methods from MOST SAFE to LEAST SAFE a) warm in an erlenmyer flask on a hot plate in a hood b) warm in a round bottom flask attached with a reflux condensor in a hood c)warm in a beaker on a hot plate d) warm in a test tubeĀ  on a warm waterbath no longer on the hotplate