The town of Isle is on a small island connected to Big City by a single bridge. Most of the residents of Isle work in Big City. As a result, the bridge becomes very congested for two hours each day at the typical morning and evening commute times. Which of the following policies considered by the mayor of Isle would likely be most efficient in alleviating the congestion? a. a fixed toll for the brdge payable by every vehicle crossing the brdge at all days and times
b. A variable toll for the brdge payable only by vehicles crossing the brudge during the congested cimmute times
c. Any vehicle crossing the bridge at any time must have a sticker ppaid for with a one time fee of $25
d. A press conferecne in which the mayor requests that people try to cross the brdge earlier or later than the typical commute times