Final answer:
The number of digits available for the formation of a number plate cannot be determined based on the given options.
Step-by-step explanation:
Since the options represent the number of digits available, we can rule out the options after understanding that number plates usually consist of both letters and numbers. In most countries, a standard license plate typically contains a combination of letters and numbers. For example, a common format may be a mix of three letters followed by three numbers, or vice versa.
Therefore, since none of the options given explicitly mention both letters and numbers available for the formation of the number plate, it would be difficult to determine the correct answer from the given options. However, in a realistic scenario, the number of digits available for the formation of a number plate would typically be more than 9 digits.