The Physics Club executive committee at ESU (Enormous State U) consists of four members, of whom one is designated as chairperson, and two as secretaries. There are five people available to serve on the committee. Which of the following are valid decision algorithms to count the number of possible committees that can be formed? Step 1: Choose a person to exclude from the committee: 1 choice Valid Step 2: Choose a chairperson: 1 choice Step 3: Choose an ordinary member: 3 choices Invalid Step 1: Choose a person to exclude from the committee: 5 choices Valid Step 2: Choose a chairperson: 5 choices Step 3: Choose an ordinary member: 4 choices Invalid Step 1: Choose an ordinary member: 5 choices O Valid Step 2: Choose a chairperson: 4 choices Step 3: Choose a person to exclude from the committee: 3 choices Invalid Step 3: Choose an ordinary member: 3 choices Step 1: Choose a person to exclude from the committee: 5 choices Valid Step 2: Choose a chairperson: 4 choices Invalid The number of possible committees is Check Clear Help!