Explanation

When creating a new Delta Live Tables pipeline, the minimum requirement is to specify at least one notebook library to be executed. This is because Delta Live Tables pipelines are defined using notebooks or Python files that contain the data transformation logic.

Let's analyze each option:

A. A key-value pair configuration - ❌ NOT required

• While configurations can be specified to customize pipeline behavior, they are optional and not mandatory for pipeline creation.

B. The preferred DBU/hour cost - ❌ NOT required

• Cost settings are optional and can be configured later or left to default settings.

C. A path to cloud storage location for the written data - ❌ NOT required

• Storage locations can be configured but are not mandatory. Databricks provides default storage locations.

D. A location of a target database for the written data - ❌ NOT required

• Database locations can be specified but are optional. Pipelines can use default database settings.

E. At least one notebook library to be executed - ✅ REQUIRED

• This is the essential requirement for any Delta Live Tables pipeline. Without source code (notebooks or Python files) containing the data transformation logic, there would be no pipeline to execute.

Key Points:

1. Delta Live Tables pipelines are defined programmatically using notebooks or Python scripts.
2. The pipeline definition includes the data transformation logic written in these source files.
3. All other configurations (storage locations, databases, costs, etc.) are optional settings that can be customized but are not required for initial pipeline creation.
4. Without source code to execute, the pipeline would have no transformation logic to perform.

Therefore, the correct answer is E - At least one notebook library to be executed.