Which of the following about Gram staining is most correct:
A.
Heating is done to promote entry of stain into cell wall of both Gram +ve and –ve bacteria
B.
If observed staining technique and microscopy before decolorization, both Gram +ve and –ve bacteria appear same
C.
Teichoic acid is present in the cell wall of Gram–ve bacteria
D.
Results must be observed under electron microscope