What is the output of this program?

#include

using namespace std;

struct Time $\{$

int hours;

int minutes;

int seconds;

$\}$;

int toSeconds$($Time now$)$

$\{$

return $3600*$ now.hours $+60*$ now.minutes $+$ now.seconds;

$\}$

int main$()$

$\{$

Time t;

t$.$hours $=5$;

t$.$minutes $=30$;

t$.$seconds $=45$;

cout $<<$ "Total seconds: $"<<$ toSeconds$($t$)<<$ endl;

return $0$;

$\}$

a$.$

Total seconds: $19844$

b$.$

Total seconds: $19845$

c$.$

Total seconds: $15000$

d$.$

Total seconds: $20000$