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For guaranteed EC2 capacity in specific Availability Zones for a short-term event, use On-Demand Capacity Reservations with AZs specified. This ensures your EC2 instances can launch when needed, even during peak demand.
Reserved Instances – Reduce your Amazon EC2 costs by making a commitment to a consistent instance configuration, including instance type and Region, for a term of 1 or 3 years. Capacity Reservations – Reserve capacity for your EC2 instances in a specific Availability Zone. do not confuse
A Opção D (Reserva de capacidade sob demanda especificando a região e as zonas de disponibilidade) é a melhor solução, pois garante a capacidade necessária nas zonas de disponibilidade específicas para um evento de curta duração, atendendo ao requisito de forma eficiente e econômica.