Exam AWS Certified Solutions Architect - Associate SAA-C02 topic 1 question 786 discussion

A company is developing a new machine learning (ML) model solution on AWS. The models are developed as independent microservices that fetch approximately
1 GB of model data from Amazon S3 at startup and load the data into memory. Users access the models through an asynchronous API. Users can send a request or a batch of requests and specify where the results should be sent.
The company provides models to hundreds of users. The usage patterns for the models are irregular. Some models could be unused for days or weeks. Other models could receive batches of thousands of requests at a time.
Which design should a solutions architect recommend to meet these requirements?