Which of the following pieces of code performs explicit conversion?

a$.$

double bankBalance $=189\mathrm{.}66$;

float weeklyBudget $=($float$)($bankBalance $/4)$;

b$.$

double bankBalance $=189\mathrm{.}66$;

float weeklyBudget $=($bankBalance $/4)($float$)$;

c$.$

double bankBalance $=189\mathrm{.}66$;

float weeklyBudget $=($double$)($bankBalance $/4)$;

d$.$

double bankBalance $=189\mathrm{.}66$;

double weeklyBudget $=($float$)($bankBalance $/4)$;