What will be the output of the following PHP code ? <?php $hello = "Hello World"; $bye = "Bye": echo $hello;"$bye": ?> a. Bye b. Hello worldBye c. Error d. Hello World 2.) What will be the output of the following PHP <?php $On_e = 1; Stw_O = 2; Sthree = 3; i Sfour = 4 . echo Son_e / Stw_Q + Sthree / ?> a. Error o c. 0.05 d. 0.75 3.) What will be the output of the following PHP code? <?php $x = 30; $y = 20; $z = 10; echo $x + $y - $z/($z - $y); a. -4 b. 41 C.-5 d. 51 4.) What will be the output of the following PHP code? <?php one = 1; two = 2; three = 3; four = 4; echo "one / two + three ?> a. Error b. 0.05 c. 0.75 d. 1.25 PHP code ? 5.)which datatype below has two values a. doubles b. strings c. boolean d. null