The type of insurance used to indemnify a firm for the loss of earnings brought about by the death or disability of an officer or other significant employee is

Business continuation life insurance is aimed at ensuring that a business can continue operating after the death of an owner or partner. While it provides funds to facilitate the transfer of ownership, it does not specifically address the loss of earnings due to the incapacitation of key employees, making it less relevant to the question.

Business overhead insurance covers the ongoing expenses of a business during a period when the owner is unable to work due to disability. However, it does not provide indemnification for lost earnings resulting from the death or disability of a key employee, thus failing to meet the criteria outlined in the question.

Employee welfare insurance typically encompasses benefits related to employee health and well-being, such as health insurance or retirement plans. It does not specifically indemnify a business for loss of earnings due to the absence of key personnel, making it unrelated to the context of the question.