A panel light in the control room of a satellite launching site is to go on if the pressure in both the oxidizer and fuel tanks is equal to or above a required minimum value and there are 15 minutes or less to ‘lift-off ’, or if the pressure in the oxidizer tank is equal to or above the required minimum value and the pressure in the fuel tank is below the required minimum value but there are more than 15 minutes to ‘lift-off ’, or if the pressure in the oxidizer tank is below the required minimum value but there are more than 15 minutes to ‘lift-off’. By using a truth table, write down a Boolean expression to represent the state of the panel light. Minimize the Boolean function.