What are the initial settings of an user created security group?

A car rental company has built a serverless REST API to provide data to its mobile app. The app consists of an Amazon API Gateway API with a Regional endpoint, AWS Lambda functions, and an Amazon Aurora MySQL Serverless DB cluster. The company recently opened the API to mobile apps of partners. A significant increase in the number of requests resulted, causing sporadic database memory errors.
Analysis of the API traffic indicates that clients are making multiple HTTP GET requests for the same queries in a short period of time. Traffic is concentrated during business hours, with spikes around holidays and other events.
The company needs to improve its ability to support the additional usage while minimizing the increase in costs associated with the solution.
Which strategy meets these requirements?

Your company is in the process of developing a next generation pet collar that collects biometric information to assist families with promoting healthy lifestyles for their pets Each collar will push 30kb of biometric data In JSON format every 2 seconds to a collection platform that will process and analyze the data providing health trending information back to the pet owners and veterinarians via a web portal Management has tasked you to architect the collection platform ensuring the following requirements are met.
Provide the ability for real-time analytics of the inbound biometric data Ensure processing of the biometric data is highly durable. Elastic and parallel The results of the analytic processing should be persisted for data mining Which architecture outlined below win meet the initial requirements for the collection platform?

A Solutions Architect is designing a new application that will be hosted on EC2 instances. This application has the following traffic requirements:
- Accept HTTP(80)/HTTPS(443) traffic from the Internet.
- Accept FTP(21) traffic from the finance team servers at 10.10.2.0/24.
Which of the following AWS CloudFormation snippets correctly declares inbound security group rules that meet the requirements and prevent unauthorized access to additional services on the instance?

A gaming company is using Amazon DynamoDB to run a high-score leaderboard and record the game progress for users The company is launching a new game that is expected to be active for years The database activity at launch cannot be predicted; but it is expected to stabilize after 4 weeks Currently, the company is using on-demand capacity mode for processing reads and writes on all DynamoDB tables.
What is the MOST cost-effective way for the company to control the DynamoDB capacity during the new game launch?