💡 Detailed Explanation
"～の至り" is a formal expression used with specific nouns representing emotions, such as "光栄" (honor) or "感激" (deep emotion), to indicate that the feeling is at its peak. "光栄の至り" is a common idiomatic phrase. "の極み" is used with nouns like "贅沢" (luxury). "限り" follows adjectives, as in "嬉しい限りだ" (I couldn't be happier). "極まり" is part of the expression "～極まりない", which follows the stem of na-adjectives to mean "extremely".