What is the difference between SARS$-$CoV$-2$ and COVID$-19?$

SARS$-$CoV$-2$ is the coronavirus and COVID$-19$ is the bacteria.

SARS$-$CoV$-2$ is the bacteria and COVID$-19$ is the disease

SARS$-$CoV$-2$ is the disease and COVID$-19$ is the virus.

SARS$-$CoV$-2$ is the virus and COVID$-19$ is the disease