Which of the following is an example of fixed ratio reinforcement schedule?a.feeding your fish every day at 8 a.m.b.checking your e-mail at random times throughout the day instead of every time you hear the new e-mail notification.c.knowing you will get to play miniature golf as soon as you collect 10 gold stars for your reward chart.d.playing the slot machine.Difficulty: ModerateAPA Standard: 1.2, 1.3, 2.1