what will be the output of following code var 1..., PHP Fundamentals, PHP

Question:What will be the output of the following code?
$var = 1 + "-1.3e3";
echo $var;

A -1299 
B 1 
C 1-1.3e3 
D Error:cannot add an integer and a string

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Question:What will be the output of the following code? $var = 1 + "-1.3e3"; echo $var;