Which sentence describes the following regular expression match? preg_match(‘/^\d+(?:\.[0-9]+)

Which sentence describes the following regular expression match?
preg_match(‘/^\d+(?:\.[0-9]+)?$/’, $test);

A.
It matches any string.

B.
It does not match anything

C.
It matches float numbers without thousand seperators.

D.
It matches float numbers with thousand seperators.

E.
It matches binary integer numbers.

Explanation: