Answer:
Cluster sampling
Step-by-step explanation:
The kind of sampling described here is cluster sampling. In the cluster sampling method, a population is divided into clusters. Some of these clusters would then be randomly selected as samples. Each cluster is a mini representation of the entire population. The researcher in cluster sampling studies the whole clusters.
In this question we have a cluster of colleges that have been selected and a poll of all employees in these clusters.
This makes the answer cluster sampling