During the oxidation of $NADH + H^+$,through which complex do electrons $NOT$ pass?

Given below are two statements.
$Statement-I$: During aerobic respiration, $ETS$ releases energy in a stepwise manner to prevent damage to cells.
$Statement-II$: During aerobic respiration, $ETS$ provides water molecules.
In the light of the above statements, choose the correct answer from the options given below.

Oxidative phosphorylation is

Which of the following does not function as an electron carrier?

During $\text{ETS}$,ubiquinone receives reducing equivalents via

Where does the synthesis of $ATP$ from $ADP + \Pi$ occur by $ATP$ synthase?