FG II DE (True as they form a right angle with HB individually) and DE II AC (False as AC does not form a right angle with HB) (First option is incorrect)
HB ⊥ AC (False AC does not form a right angle with HB) (Second option is incorrect)
FG ⊥ HB (True as FG form a right angle with HB ) and AC ⊥ HB (False as AC does not form a right angle with HB) (Third option is incorrect)
FG ⊥ HB (True as FG form a right angle with HB ) and FG II DE (True as they form a right angle with HB individually)
The answer is the last option.
