The equilibrium constant K for a certain reversible reaction is 1.03. Which of the following is true for the reaction?

At equilibrium, the concentration of reactants is 0.
At equilibrium, the concentration of reactants and products is almost equal.
When the rates of forward and reverse reactions are equal, there are mostly products in the reaction mixture.
When the rates of forward and reverse reactions are equal, there are mostly reactants in the reaction mixture.