Final answer:
Carnival Cruise Lines should utilize a multi-channel marketing approach to maximize reach to a large audience.
Step-by-step explanation:
For Carnival Cruise Lines' advertising campaign strategy, they should consider utilizing a multi-channel marketing approach to engage customers through various mediums simultaneously. This means incorporating different channels such as social media platforms, online advertising, traditional advertising channels like television and print media, as well as personalized marketing techniques and direct mail campaigns. By combining these different channels, Carnival Cruise Lines can maximize their reach to a large audience and target different consumer segments effectively.