Which of the following is/are based on the ability-to-pay concept? 1. A flat tax II. Johnson City charges all households a flat fee of $25 per month for water usage. III. Boone County recently established Route 89 as a toll road. All cars traveling from East Johnson City to Appleton pay $1. O Only statement I is correct. Only statement II is correct. O Statements II and III are correct. All statements are correct