Which of the following is a type of project management tool?

Spreadsheets are a widely recognized type of project management tool because they provide a flexible framework for organizing, analyzing, and visualizing project data. They can be used for a variety of project management tasks, including tracking project timelines, budgets, resources, and deliverables. With features such as formulas, pivot tables, and charts, spreadsheets allow project managers to perform complex calculations and create visual representations of data, making it easier to monitor project progress and make informed decisions.

The other options listed serve important functions within a business context but do not specifically qualify as project management tools. Cost reports are typically used for budget assessment and financial tracking rather than managing projects directly. Email communications facilitate discussions and information sharing but lack the structured organization that project management tools provide. Performance reviews focus on employee assessment and development instead of the management of project tasks or resources. Thus, spreadsheets stand out as a primary tool for managing various aspects of projects effectively.