What does the $/[$A$-$Za$-$z$][$A$-$Za$-$z$\backslash$d$]+/$ match in programming language?

Question $18$ options:

A$.$ Strings that begin with a letter, followed by only digits

B$.$ Strings that begin with a letter, followed by one or more letters or digits

C$.$ Strings that begin with digit, followed by one or more letters or digits

D$.$ Strings that begin with digit, followed by at most one letter or digit