Which of the following indicates different forms of a number that a student could use?

The correct answer identifies various ways in which a number can be represented, which is key in understanding the concept of numbers in mathematics.

Standard form refers to the typical way of expressing a number using digits, while word form translates that number into words. Expanded form breaks a number down into the sum of its parts, showing the value of each digit, and expanded notation is a similar concept that emphasizes the representation of numbers based on their place values. These forms allow students to see and understand numbers from multiple perspectives, which enhances numerical literacy and comprehension.

The other options include different concepts that do not solely focus on the variety of representations of a single number. Therefore, option A stands out by specifically showcasing the various forms—written or expressed detailing of numbers that students can use to enhance their understanding of mathematical concepts.