In water systems using surface water (or groundwater under the direct influence of surface water) the MCL for total trihalomethanes is _____ mg/L and the MCL for HAA5 (haloacetic acids) is _____ mg/L.
a) 0.080, 0.060
b) 0.060, 0.080
c) 0.100, 0.050
d) 0.050, 0.100