How many strings will be added to the string pool upon execution of the following code block?public static void main$($String$[]$ args$)\{$ String str $=$ "Hello There!"; String mtr $=$ "Hello" $+""+$ "There" $+"!"$; String dtr $=$ "Hello $"+$ "There" $+"!"$; String gtr $=$ "Hello There" $+"!"$; $\}$