Explanation:

- To find the binary equivalent of an octal number, convert each octal digit to its 3-bit binary form.

- Octal number 473 can be broken down as:

- 4 in octal = 100 in binary

- 7 in octal = 111 in binary

- 3 in octal = 011 in binary

- Combine these binary numbers: 100 111 011

- Let's evaluate the given options:

- Option 1: 100111011 (Your option)

- Option 2: 100111111 (Incorrect)

- Option 3: 110111011 (Incorrect)

- Option 4: 110001011 (Incorrect)