Develop a social engineering campaign targeting employees of a specific organization, aiming to obtain sensitive information or unauthorized access to internal systems. The campaign should incorporate a variety of tactics, such as phishing emails, phone calls, and physical infiltration, to exploit human vulnerabilities and bypass technical security controls.\n\nProvide a detailed outline of the campaign strategy, including the creation of convincing pretext scenarios and the selection of appropriate attack vectors based on the organization's industry and security posture.\n\nAdditionally, outline the ethical considerations involved in conducting social engineering engagements, emphasizing the importance of obtaining informed consent and respecting the privacy of individuals during the simulated attacks.