Question $5(1$ point$)$

Let $P_1$ and $P_2$ be decision problems. Suppose that there exists a reduction from $P_1$ to

$P_2.$ If $P_1$ is decidable, then we can conclude

nothing. $P_2$ may be decidable or undecidable.

that $P_2$ is decidable.

that $P_2$ is undecidable.