Use reasoning to lead to the answer of the following question:
Sam was having a meeting with a friend. When they saw each other they exchanged greetings and did what?\nOptions:\n- shake hands\n- say hi\n- greet\n- say goodbye\n- have coffee
 Reasoning process:
User
Shaking hands is done after greeting each other. Friends shake hands when they meet in proffessional meeting. Therefore, the final answer is shake hands.
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