To answer this question, you need to understand the TRUNC function.
The TRUNC function is used to truncate a number to a specified number of decimal places. It removes all decimal places beyond the specified number without rounding the number.
In this case, the TRUNC(12.3456, 3) means truncating the number 12.3456 to 3 decimal places.
Let's evaluate each option:
Option A) 12.3 - This option is incorrect because it only has one decimal place, while the TRUNC function truncates the number to 3 decimal places.
Option B) 12.3000 - This option is incorrect because it has four decimal places, while the TRUNC function truncates the number to 3 decimal places.
Option C) 12.346 - This option is incorrect because it has three decimal places, while the TRUNC function truncates the number to 3 decimal places and removes the decimal places beyond that.
Option D) 12.345 - This option is correct because it has three decimal places, which matches the result of the TRUNC(12.3456, 3) function.
Therefore, the correct answer is D) 12.345.