Question 18

Shareware is a functionally limited version of software available at no cost.

Shareware refers to software that is distributed for free but typically includes functionality limitations or trial periods, encouraging users to purchase the full version. This model allows users to test the software before committing to a purchase.

A) Closed-source

Closed-source software refers to proprietary software whose source code is not available to the public. This option does not fit the description provided in the question, as closed-source software is not inherently free or limited in functionality for trial purposes.

B) Shareware

Shareware is indeed a functionally limited version of software that users can access at no cost. It allows users to evaluate the software with the intention of purchasing the full version later, making it the correct answer to the question.

C) Freeware

Freeware is software that is completely free to use without any functional limitations. Unlike shareware, freeware does not encourage users to purchase a full version, thus it does not match the description of being limited in function.

D) Public domain

Public domain software is not owned by anyone and can be used freely without restrictions. This option does not align with the question, as it does not refer to a version that is limited in functionality.

Conclusion

Shareware is the only option that accurately describes software that is available at no cost but comes with functional limitations, designed to entice users to eventually purchase the complete version. All other options fail to meet the criteria set by the question, either being entirely free without limitations or not fitting the definition of a trial version.