Final answer:
Given the information provided, it is not possible to confidently determine the correct expression for E²max in terms of p, d, c, and u0 from the provided answer choices, as they do not appear to be directly derived from the standard relativistic energy and momentum formulas.
Step-by-step explanation:
The question pertains to the concept of relativistic energy and momentum in Physics, particularly as applied to particles and photons. From the provided snippets which discuss relations involving energy (E) and momentum (p), and given the various physical constants such as the speed of light (c) and the permeability of free space (u0), we aim to find the expression for E²max in terms of the provided variables. The relationship E² = p²c² + m²c² is fundamental here, but regarding the proposed answers, none of the options seems to be derived directly from the provided equations or standard physics equations involving these constants. Therefore, with given information, we cannot confidently select any of the provided answer choices for E²max.