Variables named firstNum, firstDec, and firstStr are declared in the JavaScript block. Use the $+$ operator to perform the following sequence of operations:

Sum the variable named firstNum with the variable named secondNum and store the final value in the variable named finalNum.

Sum the variable named firstDec with the variable named secondDec and store the final value in the variable named finalDec.

Concat the variable named firstStr with the variable named secondStr and store the final value in the variable named finalStr.

Note:

In the JavaScript block, replace the comments with the appropriate code, if required.

Do not change any variable value except finalNum, finalDec, and finalStr.

This lab might have steps that are not compatible with all the browsers. Click Show Table to check the JavaScript compatibility list of keywords and methods and use an afunction execute$($firstNum$,$firstDec,firstStr$)\{$

const secondNum $=23$;

const secondDec $=3\mathrm{.}1$;

const secondStr $=$ "uCertify";

$/*$Store sum of firstNum and secondNum below$*/$

let finalNum $=$ firstNum$+$secondNum;

$/*$Store sum of firstDec and secondDec below$*/$

let finalDec $=$ firstDec$+$secondDec;

$/*$Store concatenation result of firstStr and secondStr below$*/$

let finalStr $=$ firstStr$+$secondStr;

document.write$($finalNum$+"$

$"+$finalDec$+"$

$"+$finalStr$)$;

$/*$Write your code here$*/$

$\}$

execute$(12,10\mathrm{.}1,$"Hello $")$;ppropriate browser to perform the lab.