1 আলোক বর্ষ = ?

$3 \times 10^{8} \mathrm{~km}$

$9.46 \times 10^{12} \mathrm{~km}$

$2.46 \times 10^{12} \mathrm{~km}$

$5.46 \times 10^{12} \mathrm{~km}$