Final answer:
The question related to integrating social media is not relevant to Cintab's decision about investing in a mass marketing campaign, which typically involves traditional media channels rather than social platforms.
Step-by-step explanation:
The question pertains to whether the international web retailer Cintab should invest in a mass marketing campaign. Among the options provided, the only one that is NOT relevant to Cintab's decision regarding a mass marketing campaign is "How can social media be integrated into the mass marketing strategy?" This question is not relevant because mass marketing campaigns traditionally focus on channels such as magazines and newspapers, not social media. On the other hand, questions about the impact of mass marketing on brand perception and loyalty, alignment with the company's customer-centric approach, and the costs associated with mass marketing are directly relevant and critical to the decision-making process.