How can I figure out...

Ms$.$ Santos is in the stage of creating the methodology of her research. Her research is about the effectiveness of the company's public relation strategies. The target of the study are people from Baguio. In her sampling she considered the latest population of Baguio and considered taking $1/4$ of the population because she finds it substantial for her study.

What sampling technnique will be used?

Ramdom

Cluster

Stratified

Purposive

Convenience