Free Microsoft AB-100 Exam Dumps May 2026

The correct answer is A. a Model Context Protocol (MCP) server.

In Microsoft Foundry agent scenarios, MCP is used to let an agent discover and use external tools dynamically at runtime without requiring the agent itself to be modified each time a new tool or capability is added.

Why this is correct:

MCP standardizes how tools are exposed to agents

It allows the agent to connect to external capabilities in a flexible, runtime-driven way

New tools can be made available through the MCP server without rebuilding or updating the core agent definition

This directly matches the requirement: ''ensure that an agent can dynamically use external tools at runtime without updating the agent.''

Why the other options are not correct:

B . a Microsoft Foundry hub A hub is used more for organizing and managing AI resources/projects, not specifically for dynamic runtime tool exposure.

C . Microsoft Copilot Studio Copilot Studio is for building conversational agents and workflows, but the question is specifically about dynamic external tool use in Foundry agents.

D . Azure AI Search Azure AI Search is for indexing and retrieving knowledge, not for dynamically exposing executable external tools.

The requirement is to evaluate the potential cost of an AI solution before deployment so the company can support a return on AI investment (ROAI) analysis.

The correct choice is C. Azure pricing calculator.

Why C is correct: The Azure pricing calculator is used to estimate the expected cost of Azure services before implementation. For an AI solution such as sentiment analysis on customer product reviews, it helps estimate likely spending across the relevant Azure components and usage patterns. That makes it the right tool for cost forecasting as part of ROAI planning.

Why the other options are not correct:

A. Total Cost of Ownership (TCO) Calculator TCO is mainly used to compare broader infrastructure costs, often for migration or environment-level cost comparisons, not detailed service pricing estimation for a planned Azure AI solution.

B. Azure Reservations Reservations are a purchasing/discount mechanism, not the primary tool for estimating potential solution cost.

D. Azure Monitor Azure Monitor tracks operational metrics and runtime health after deployment; it is not used for pre-deployment cost estimation.