In a reversible reaction, what do the rate constants k₁ and k_-1 represent?

Both k₁ and k_-1 represent the rate of the forward reaction.

k₁ represents the rate of the forward reaction, and k_-1 represents the rate of the reverse reaction.

Both k₁ and k_-1 represent the rate of the reverse reaction.

k₁ represents the rate of the reverse reaction, and k_-1 represents the rate of the forward reaction.