Is it drop down list or filter ?

Hi,

I am trying to automate the site which contains web table where i need to filter the values based on fields (Created by, Select type of record, Review link etc). When i move mouse over the field it shows filter icon. I am not sure whether it is drop down list or filter. I want to select the name after clicking on the "Created By" icon. but i am not able to select the name.

I have attached the screenshot, please guide me, how it be handled using drop list ?

Thanks,
Arun