What output does the below pseudo code produces?

[answerhappygod]

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if (adpushup.config.platform === "MOBILE") {
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Tree_node function(Tree_node x)
{
Tree_node y = x.left;
x.left = y.right;
y.right = x;
return y;
}
a) right rotation of subtree
b) left rotation of subtree
c) zig-zag operation
d) zig-zig operation