A) A-Rhizobial bacteria, B-Cortex cell, C-Outer cortex, D-Infection thread
B) A-Rhizobial bacteria, B-Cortex cell, , C-Inner cortex, D-Infection thread
C) A-Rhizobial bacteria, B-Endodermal cell, C- Inner endodermis, D-Infection thread
D) A-Nitrosomonas bacteria, B-Cortex cell, C- Inner cortex, D-Infection thread