Hurricane Katrina wore easily recognizable blue uniforms with distinctive gold badges. Which nineteenth$-$century organization was among the first to adopt the practice of wearing formal police uniforms with its three$-$quarter$-$length royal blue coats, white trousers, and top hats?

a$.$ Colquhoun's Marine Police

b$.$ the first London Metropolitan Police

c$.$ Fielding's Bow Street Runners

d$.$ the central London horse patrol