For the hypothetical second-order reaction, X → Y, which of these graphs is valid?

Graph showing a curved line for 1/[X] vs. Time, indicating a second-order reaction.

Graph showing a straight line for 1/[X] vs. Time, indicating a first-order reaction.

Graph showing a curved line for ln[X] vs. Time, indicating a first-order reaction.

Graph showing a straight line for [X] vs. Time, indicating a zero-order reaction.