Given the queue speedLimits, what does back$()$ return?

#include

#include

using namespace std;

int main$()\{$

queuespeedLimits;

speedLimits.push$(55)$;

speedLimits.push$(20)$;

speedLimits.pop$()$;

speedLimits.push$(45)$;

speedLimits.pop$()$;

speedLimits.push$(30)$;

cout $<<$ speedLimits.back$()$;

return $0$;

$\}$

Group of answer choices

$20$

$30$

$45$

$55$