Final answer:
None of the expressions (A) 5^4, (B) 11^2, (C) 2^8, or (D) 12^3 are in standard form, as standard form means writing a number without exponents. If the question intended the simplest form with the smallest exponent, (B) 11^2 would be considered the simplest, but it's still not in standard form.
Step-by-step explanation:
The question is asking us to identify which of the given expressions is in standard form. Standard form in mathematics often refers to writing numbers without using exponents. Out of the choices provided, (A) 5^4, (B) 11^2, (C) 2^8, and (D) 12^3, none are written in standard form since all expressions contain exponents.
However, if the question implies identifying the simplest expression or the one with the smallest exponent (which is typically not how standard form is defined), then choice (B) 11^2, being a square, could be considered the simplest. Squaring a number means multiplying the base by itself, as in 5^2 = 5 x 5. Thus, 11^2 would equal 11 x 11. But for true standard form, we do not use exponents; for example, instead of 11^2, we would simply write 121.