$1.$ At equilibrium, the Gibbs free energy change $($G$)$ is $\_\_\_,$ the chemical potential of each component is $\_,$ and the reaction quotient $($Q$)$ is $\_\_\_$ the equilibrium constant $($K$).$

$-$ a$)$ positive, equal, greater than

$-$ b$)$ zero, equal, equal to

$-$ c$)$ negative, unequal, less than

$-$ d$)$ zero, unequal, greater than