WHAT's THE BEST TYPE OF CAULK TO Use

Aib
by Aib
I have a walk-in shower, i.e., minimal lip to step over. The caulk that was used by the builder between the floor & the 1st vertical tiles is coming undone. It can be pulled out & is stretchy in nature. I don't know what type this is or what the best type to replace it would be? Your help would be appreciated. Thank you.

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