What kind of flow diagram allows tasks to be performed repeatedly until a condition is met?

The correct answer is iteration. In programming and flow diagrams, iteration refers to the repetition of a set of instructions or tasks until a specific condition is met. This allows for efficient handling of processes that need to be executed multiple times, such as loops in programming.

When a condition is evaluated, if it is still true, the flow diagram will loop back to repeat the set of tasks. This concept is foundational in computer science, as it enables the execution of repetitive tasks without the need to write the same code multiple times.

In contrast, a sequence flow diagram represents tasks that are executed in a specific order, selection diagrams illustrate decisions based on conditions leading to different branches, and subroutines are used to encapsulate a block of code that can be used multiple times but does not inherently handle repetition on its own. Each of these types focuses on different aspects of controlling the flow of execution in a program, making iteration particularly important for repeated task execution.