You finished cutting raw meat on a cutting board. the cooked potatoes for the salad need to be cut. before cutting the potatoes, you should

Wash and rinse the cutting board and sanitize it.

Explanation:

Cutting board is used in the kitchen to cut the food products and after any food chop on cutting board, the board should be clean and sanitized properly because no raw food is free from bacteria and the cutting board can transfer the bacteria to other food.

Especially in the case of raw meat products the cutting board should be washed with soapy water and rinsed with warm water because meat products contain many pathogenic bacteria like Salmonella, pathogenic strain of E.coli, Listeria monocytogenes, etc. which can transfer to other food and can cause foodborne illnesses.

So before cutting potatoes, the cutting board should be sterilized properly.