Math-english for non-natives: What does "supported in" mean?

Question

As a non-native English speaker, I am struggling with the following sentence:

"Fix a function $f:\mathbb{R}\to\mathbb{C}$ such that $f$ is supported in the unit Ball."

Does this mean $\operatorname{supp} f \subseteq B_1(0)$, $B_1(0) \subseteq \operatorname{supp} f $ or even $\operatorname{supp} f = B_1(0)$?

Thanks in advance!

Answer 1

It means that $\operatorname{supp} f \subseteq B_1(0)$ as you suspected.