Which of the following actions is completed by only using an Assignment element? Select three that apply.

An Assignment element in Salesforce Flow is specifically designed to manipulate data by assigning values to variables. This action can include performing calculations or modifying the data stored in various types of variables.

The first option, which discusses adding values stored in a variable, is precisely what the Assignment element is intended for. It allows users to take a value from one variable and assign it to another, or update an existing variable with a new value, making it central to data manipulation within Flow.

When it comes to the other options, the Assignment element is not directly suited for operations involving screen components or record collections, as these typically require different elements in the Flow. Screen components are often used for user input and display, and therefore involve elements like Screen or Input Fields rather than Assignment. Similarly, record collections are often processed through specific operations or elements designed for handling multiple records, which differentiates their usage case from that of a simple Assignment. The Assignment element can technically handle single record variables, but this is only a small part of its broader capabilities.

In summary, the action that pertains to only using an Assignment element is primarily focused on manipulating the data within variables, as performed in the first option.