In a reversible reaction, a catalyst :

increases the rate of the forward reaction only

increases the rate of forward reaction to a greater extent then that of the backward reaction

increases the rate of the forward reaction and decreases that of the backward reaction to different extent

increases the rate of the forward and backward reaction equally

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Catalyst is a substance which lowers activation energy of reaction because it provides alternate pathway for reaction. Also, it increases backward and forward reaction to the same extent. As an increase in a rate of reaction in forward direction by a catalyst for a reaction in equilibrium bring in an increase in concentration of products and thus , rate of backward reaction also increase to some magnitude and the equilibrium position is not altered. Due to this lower activation energy, equilibrium attains faster but it does not change overall enthalpy of reaction.

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