Final answer:
To express the polynomial d^2 d^3 − d^4/3 in standard form, the term that should be written first is Option 4: d^4/3.
Step-by-step explanation:
To express the polynomial d^2 d^3 − d^4/3 in standard form, the terms should be written in descending order of their exponents. The term with the highest exponent should be written first. Looking at the options, Option 4: d^4/3 has the highest exponent, so it should be written first.