Change A.:
I have found it beneficial to place the awareness at the top and bottom of spine simultaneously. This results in the energies being balanced throughout the body.
In addition to placing the awarenes at the top and bottom of spine, if it is placed on the right and left side of the spine simultaneously as well and then the breathing is relaxed (no additional muscles being used other than those needed for inhalation and exhalation), then that results in total relaxation.