Given the following function prototype:

$$

int test$($float$,$ char$)$;

$$

which of the following statements is valid?

a$.$

cout $<<$ test$(12,$ &$)$;

b$.$

cout $<<$ test$("12\mathrm{.}0","$&$")$;

c$.$

cout $<<$ test$("12","$&$")$;

d$.$

int u $=$ test$(5\mathrm{.}0,\text{'}*\text{'})$;