The correct choice would be the most comprehensive support tier offered, giving access to 24/7 senior engineers, proactive guidance, and a dedicated point of contact for addressing infrastructure and architectural queries. Such a level of support is essential for managing critical applications and is characteristic of a premium enterprise-tier support plan. The basic developer-oriented tier typically provides only business-hours email support and lacks direct access to technical account management or proactive service event management. On the other hand, the mid-level business tier does not include a dedicated contact, whereas the on-ramp version offers reduced features in comparison to the full premium enterprise package.