Following are the concatenation operator

+
&
&&
none of theses

The correct answer is: A. +

The concatenation operator is used to join two strings together. For example, “Hello ” + “world” would result in the string “Hello world”.

The & operator is the bitwise AND

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operator. It is used to compare two bits and return 1 if both bits are 1, and 0 otherwise.

The && operator is the logical AND operator. It is used to compare two Boolean values and return 1 if both values are true, and 0 otherwise.

The none of theses option is incorrect because it does not include the correct answer.