How many $ATP$ molecules are produced when $2 H^+$ ions pass through the $ATP$ synthase complex?

Given below are two statements.
Statement-$I$: Cytochrome $c$ is a small, copper-containing protein loosely attached to the inner membrane.
Statement-$II$: Cytochrome $c$ acts as a mobile electron carrier transferring electrons between complex $I$, $II$, and $IV$.
In the light of the above statements, choose the correct answer from the options given below.

In the electron transport system in the inner mitochondrial membrane,complex-$I$ and $IV$ are respectively:

The carriers and enzymes of $ETS$ found on the inner mitochondrial membrane for complex $I$ and $IV$ are . . . . . . and . . . . . . respectively.

Cytochromes,the electron carriers in the Electron Transport System $(ETS)$,are:

$A$ : $2,4-DNP$ $(2,4-Dinitrophenol)$ is an uncoupling agent of $ETS$.
$R$ : It is soluble in lipids.