Which of the following acts as an enzyme?

Which of the following is true for inorganic catalysts?

Catalysts produced by living cells in small amounts are known as:

Enzymes which catalyse oxidoreduction between two substrates $S$ and $S'$ are known as:

Enzymes as they exist inside the cell are

$A$ : Non-competitive inhibitors have no effect on $V_{max}$.
$R$ : In non-competitive inhibition,inhibitor and substrate bind at same sites on the enzyme.