All of the following are public charities. Which of the following has unrelated business income?Second Life, which operates a store that sells donated clothing. City Youth Baseball League, which operates a coffee and cocoa vending machine in its main office for the convenience of employees. Little Beethovens, Inc., which operates a parking garage used by the general public in a busy downtown area. Operation Mother Nature, Inc., which operates a summer day camp that is staffed entirely by volunteers.