SAP Certified Professional - Solution Architect - SAP BTP

As a solution architect, you are in a meeting about the design of a new application to manage the delivery process of goods or services. The extension will be maintained by the line of business (as opposed to IT).
The following application parameters/features are discussed:
Tracking deliveries in real-time

Optimizing delivery routes -
Providing delivery notifications to customers.

Scaling according to usage -
Maintenance downtime must be short.
Which extension type is best suited for this application?

You are a solution architect helping to design a custom-built application for business users. You must follow these use case parameters:
The application requires data solely from SAP S/4HANA Cloud public edition.
The application supports create, read, update, and delete (CRUD) operations.
If multiple backend protocols are applicable the one with the fastest performance is to be used.
Which of the following combinations would you recommend for the application design?

You are a solution architect and your client needs help in choosing the appropriate SAP solution to use for their application design.
SAP SuccessFactors will trigger an “event” when employees complete a variety of tasks such as changing their address or updating their W-4 information.
The event will be caught by one of SAP’s event solutions and it will trigger (via webhook) either SAP Integration Suite or SAP S/4HANA Cloud as needed.
The number of events processed is not expected to be high.
A cloud solution is preferred.
Which of the following could be used in place of the “Placeholder Icon” in the attached diagram? (Choose two.)

A company is decommissioning its legacy ERP system in favor of adopting SAP solutions. The company is not sure which specific solutions to adopt. The company has three main business goals:
Maintain several unique business processes.
Maintain the solutions with a small budget, and limited time and resources.
Integrate several non-SAP solutions.
Which combination of solutions should the customer adopt?

The DevOps / Site Reliability Team has a question for you. Over the course of the last month, several trust certificates have expired for several SAP BTP destinations, which has in turn occupied a significant portion of their time reinstalling. They wish to be informed before the certificate expires and to have a workflow triggered automatically.
As a solution architect, which SAP BTP service would you recommend (see attached diagram)?