Look at the verb son (plural). If the verb is plural, the question word must be quiénes (with an accent).

In Spanish, you almost always need el, la, los, las before the object when asking about possession.

La respuesta a estas preguntas sería:

p219 estructura 1 de quien es practice it upd

Willie has over 15 years of experience in Linux system administration and DevOps. After managing infrastructure for startups and enterprises alike, he founded Command Linux to share the practical knowledge he wished he had when starting out. He oversees content strategy and contributes guides on server management, automation, and security.