Answer:
Open source.
Step-by-step explanation:
Open source software is an open collaboration in which computer softwares source codes are released freely by copyright holders to users to study, change, develop with and distribute to other users. It is a software developed in an open public collaboration.
Closed or proprietary software is the opposite of open source, they are developed by a large team in a licensors company. The softwares are platform based and either comes with an operating system as utility or sold to users. They are more secure than open source.