What must be done in order to concatenate a string and a float object?

a$.$ Nothing can be done, as the two data types cannot be converted to a compatible type.

b$.$ The string object must be converted to a float object via the float$()$ function.

c$.$ The float object must be converted to an integer object via the int $()$ function.

d$.$ The float object must be converted to a string object via the str$()$ function.