According to the Nokia NSP Workflow Manager Application Help2, Workflow Manager has the following characteristics:

It provides several building tools to design and create new workflows. You can use graphical editors, text editors, or import existing workflows from files or repositories.

It uses Openstack Mistral as the core workflow engine. Mistral is an open source project that provides a service for managing workflows across multiple cloud platforms.

It supports scheduling of workflow executions. You can use cron expressions or triggers to specify when and how often a workflow should run.

It supports parallel execution of many workflows. You can run multiple workflows simultaneously on different network elements or services.

Therefore, based on these sources, the correct answer is:

B. It uses Openstack Heat as the core workflow engine.

This is FALSE because Workflow Manager uses Openstack Mistral, not Heat, as the core workflow engine. Heat is another open source project that provides a service for orchestrating multiple cloud applications using templates.

The other statements are TRUE because:

A. It provides several building tools to design and create new workflows. This allows you to create workflows that suit your specific network needs and preferences.

C. It supports scheduling of workflow executions. This allows you to automate recurring network tasks and optimize network performance and availability.

D. It supports parallel execution of many workflows. This allows you to handle complex network scenarios and operations efficiently and effectively.