Check on all that is true below.
a. An exchange monitors what is happening in the economy and is a collection of stocks like the Dow Jones Industrial Average.
b. An index monitors what is happening in the economy and is a collection of stocks like the Dow Jones Industrial Average.
c. An index is where stocks are bought and sold by brokers like the NYSE or Nasdaq.
d. An exchange is where stocks are bought and sold by brokers like the NYSE or Nasdaq.