The correct answer is A) an approved servicing facility ashore. Inflatable liferafts are considered safety-critical equipment on vessels, and their maintenance and renewal must be performed by approved service providers. The operating cord on an inflatable liferaft is a vital component that must be properly replaced to ensure the liferaft functions correctly in an emergency. Approved servicing facilities have the expertise and equipment to properly inspect, service, and renew the operating cord according to the manufacturer's specifications and regulatory requirements. The other options are incorrect because they do not involve the proper procedures and oversight required for servicing inflatable liferafts. Attempting to replace the operating cord without the appropriate training and facilities could compromise the liferaft's integrity and safety.