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

• A. Both k₁ and k_-1 represent the rate of the forward reaction.
• B. k₁ represents the rate of the forward reaction, and k_-1 represents the rate of the reverse reaction.
• C. Both k₁ and k_-1 represent the rate of the reverse reaction.
• D. k₁ represents the rate of the reverse reaction, and k_-1 represents the rate of the forward reaction.