What type of validation can control the input within forms in Pega?

Property types are essential in Pega for controlling input within forms because they define the kind of data that can be stored in a property. Each property type specifies constraints on the data entered by users. For instance, if a property is defined as a numeric type, the form will only accept numeric input, thereby inherently validating the data against that predefined type. This means that when users attempt to enter data, the system can ensure that the information complies with the requirements set by the property type.

Other options present different functionalities. HTML validation relates to client-side checks and could enforce formatting rules but is not solely dedicated to data constraints. User preferences involve settings related to the user's experience, and while they may influence how data is displayed, they do not directly validate input. Rule validation refers to various validation rules defined in the application, which can be more complex and tailored but do not serve as the primary mechanism for enforcing input data types as property types do.