The virtual work method is based on the principle
[ A ] External work done = Internal work done.
[ B ] External work done + Internal work done.
[ C ] External work done - Internal work done.
[ D ] None of the above.
[ A ] External work done = Internal work done.
[ B ] External work done + Internal work done.
[ C ] External work done - Internal work done.
[ D ] None of the above.