Final answer:
The decentralized roster is used for the ranks from Second Lieutenant to First Lieutenant, which is option b). It allows for lower-level commands to make promotion decisions for these junior ranks.
Step-by-step explanation:
The decentralized roster is utilized for the officer ranks of Second Lieutenant to First Lieutenant. This means that the correct response to the question is b) Second Lieutenant to First Lieutenant. In military context, a decentralized promotion process is one where the authority for promotion decisions is delegated to a lower level, which is typically used for junior ranks like Second Lieutenant and First Lieutenant. As officers progress to higher ranks, the promotion process becomes more centralized, often requiring more stringent evaluations and approval from higher-level commands.