Section 233 was introduced to give certain companies, such as small companies and holding-subsidiary pairs, a simplified route to merge without going through the regular tribunal process. To answer this question correctly we need to get both parts right: the authority that approves the scheme, and the time within which it does so.
The combination that correctly reflects both the authority and the timeline under Section 233 is the Regional Director acting within 60 to 90 days.
Hence, the correct answer is 60-90 Days, Regional Director.