Final answer:
For a company with high-security needs for legal information storage, a Private Cloud is the optimal solution as it offers a dedicated environment with customizable security controls.
Step-by-step explanation:
If a company maintains and stores legal information requiring security norms far more aggressive than industry standards, the optimal solution would likely be a Private Cloud. A Private Cloud provides a dedicated environment where security controls can be customized to meet specific high-security needs, such as those for sensitive legal data. This contrasts with Public Cloud options like Azure or AWS, where resources and infrastructure are shared among multiple tenants, and Hybrid Clouds, which may still involve some dependence on the public infrastructure. While waiting for a next-gen cloud might imply emerging technologies, it does not guarantee higher security standards or immediate availability.