Which software package is a Relational Database Management System (RDBMS)?

The correct answer is Microsoft SQL Server because it is specifically designed as a Relational Database Management System (RDBMS). An RDBMS allows users to create, manage, and manipulate relational databases, which store data in structured formats using rows and columns. SQL Server is equipped with a powerful query language (SQL) that enables users to retrieve and manipulate data efficiently, making it a robust solution for managing large sets of structured data.

In contrast, other software packages listed are not designed for database management. For instance, Microsoft Word is a word processing application used for creating and editing text documents. Microsoft Excel primarily functions as a spreadsheet application for performing calculations and data analysis, not as a relational database system. Microsoft PowerPoint is geared towards creating presentations and is not intended to manage or query databases. Thus, Microsoft SQL Server stands out as the appropriate RDBMS among the options presented.