Which of the following is a requirement for legislation to be valid in Wyoming?

A fundamental principle in Wyoming's legislative process is the single-subject rule, which dictates that each piece of legislation should focus on only one main issue. This rule is designed to prevent "omnibus" bills, which combine multiple unrelated topics. By adhering to this rule, lawmakers can ensure clarity and transparency in the legislative process, enabling legislators and the public to understand the implications and nuances of the legislation without confusion. This requirement helps maintain focus during discussions and debates, promoting efficient decision-making and accountability.

The other options mentioned, while they may have relevance in different contexts, do not align with the essential legal requirements that ensure a bill is valid within the Wyoming legislative framework.