The correct answer is option 'C' - Directors meeting.

Explanation:
A directors meeting is a meeting held by the board of directors of a company. It is a formal gathering where important decisions are made regarding the company's operations, financials, and overall strategy. Directors meetings are crucial for the smooth functioning and governance of a company.

According to the given statement, the meeting must be held at least once in 3 months and at least four times in a year. Let's break down the options and see which one aligns with this requirement.

a) Statutory meeting: A statutory meeting is a one-time meeting that is held within a certain period after the company's incorporation. It is not required to be held regularly, so it does not meet the requirement of being held at least four times in a year. Therefore, option 'a' is not the correct answer.

b) Monthly meeting: As the name suggests, a monthly meeting is held once every month. While it meets the requirement of being held at least four times in a year, it does not meet the requirement of being held at least once in 3 months. Therefore, option 'b' is not the correct answer.

c) Directors meeting: A directors meeting is a gathering of the board of directors, and it is held to discuss and decide on important matters related to the company. Directors meetings are typically held more frequently than once every 3 months, as the board needs to stay updated and make timely decisions. Therefore, option 'c' is the correct answer.

d) None: This option is incorrect because the requirement of holding the meeting at least once in 3 months and at least four times in a year is a valid requirement for directors meetings. Therefore, option 'd' is not the correct answer.

In conclusion, the correct answer is option 'C' - Directors meeting. Directors meetings are held by the board of directors and must be conducted at least once in 3 months and at least four times in a year to ensure effective governance and decision-making.