There must be an interval of how many months between the making of two calls unless otherwise provided by the articles of association of the company.

According to the provisions of company law, when a company makes calls on shareholders to pay for their unpaid share capital, there is a mandatory time gap between consecutive calls.

Unless the articles of association specifically provide for a different interval, there must be a gap of at least one month between making two successive calls on shares.

This provision ensures that shareholders have reasonable time to arrange funds and make the required payment. The one-month interval is the minimum statutory requirement.

However, if the company's articles of association explicitly state a different time period (whether shorter or longer), then that specific provision will apply instead of the default one-month rule.

This is a standard provision found in Table F of the Companies Act, which serves as model articles for companies limited by shares.

Correct Answer: Option 4 - At least one month