What is the order of most-to-least rapidly-scaling (fastest to scale first)?

A) EC2 + ELB + Auto Scaling

B) Lambda

C) RDS

A.

B, A, C

B.

C, B, A

C.

C, A, B

D.

A, C, B

Explanation:

Lambda is designed to scale instantly. EC2 + ELB + Auto Scaling require single-digit minutes to scale out. RDS will take

at least 15 minutes, and will apply OS patches or any other updates when applied.

https://aws.amazon.com/lambda/faqs/