Which of the following correctly declares and initializes an array of $3$ integers?

int arr $[3]=\{12,23,34\}$;

float arr $[3]=\{1\mathrm{.}2,2\mathrm{.}3,3\mathrm{.}4\}$;

string arr $[2]=\{\text{'}$mike$\text{'},$ 'tina'$\}$;

all of the above