A startup processes variable IoT sensor streams and wants code that scales from zero to thousands of parallel executions, billed only for the milliseconds each execution uses. Which service model should they choose?
A. Infrastructure as a Service (IaaS)
B. Platform as a Service (PaaS)
C. Function as a Service (FaaS)
D. Database as a Service (DBaaS)
Function as a Service (FaaS) runs event‑driven functions, automatically scaling and charging based on execution count and duration.