What is a characteristic of legacy applications?

Legacy applications are often characterized by their dependence on specific environments to function properly. These applications typically were developed using older technologies and frameworks and may require particular operating systems, hardware configurations, or even specific versions of software libraries to run effectively. This reliance on specific environments can complicate migration efforts to newer platforms or cloud environments, as the compatibility may not exist.

Many legacy applications also face challenges when attempting to integrate with modern systems or services. This specificity can lead organizations to maintain aging hardware or software solutions rather than fully transitioning to more adaptable, modern approaches, which often creates gaps in functionality or integration capabilities with more current systems.

In contrast, legacy applications are generally not limited to modern environments or entirely cloud-based implementations. They may not necessarily require constant software updates, especially if they are stable and meet the organization's needs. Therefore, the characteristics of legacy applications center around their operational requirements and dependencies, making the option regarding their necessity for specific environments correct.