What is the textbox output of the following code?

Dim A$,$ B$,$ C As String

A $=200$

B $=100$

C $=$ A $+$ B

Textbox$1.$Text $=$ C

Group of answer choices

a$.$ Prints $300$ as the output

b$.$ Prints $$C$$

c$.$ Prints $200100$

d$.$ RunTime $-$ Type Mismatch Error