The notation used to represent MAC address is hexadecimal number.
Media access control address (MAC address) is a unique address assigned to a network interface controller (NIC) or network adapter. MAC addresses are also known as hardware addresses or physical addresses.
MAC addresses are 12-digit hexadecimal numbers (48 bits or 6 byte in length). MAC address allow computers to uniquely identify themselves.
Therefore hexadecimal numbers are used to represent MAC address.
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Answer: Federal Trade Commission
Explanation: The organization that collects consumer complaints, stops unfair practices, and sues companies would be the Federal Trade Commission or FTC. The FTC's Bureau of Consumer Protection stops unfair, deceptive and fraudulent business practices by: collecting complaints and conducting investigations and suing companies.