A Low Pressure Control Has a "High Event" and a "Differential

A low pressure control has a "high event" and a "differential" setting. The technician wants the system to turn on at 28 psig and shut down at 2 psig. What would be the proper settings?

A) High event: 28 psig, differential: 2 psig.
B) High event: 2 psig, differential: 2 psig.
C) High event: 28 psig, differential: 26 psig.
D) High event: 2 psig, differential: 28 psig.