Final answer:
All of the options listed, open brainstorming, closed brainstorming, and lightning brainstorming, are different types of brainstorming techniques.
Step-by-step explanation:
The question 'Which of the following is a type of brainstorming?' refers to the different techniques that can be used during the brainstorming process. When it comes to brainstorming, there are various methods that can be utilized to generate a wide range of ideas in an informal and rapid manner. Some common brainstorming techniques include open brainstorming, where any and all ideas are welcomed without criticism; closed brainstorming, which is more structured and focuses on generating ideas within specific constraints; and lightning brainstorming, which is a quick, intensive idea generation session aiming to gather thoughts as fast as possible. In this context, the correct answer would be 'All of the above,' since each one listed is a recognizable form of brainstorming found within collaborative or individual problem-solving and creative sessions.