Question 13The symbol $|a|$ means $a$ if $a$ is a positive number or zero, and $-a$ if $a$ is a negative number. For all real values of $t$ the expression $\sqrt{t^4+t^2}$ is equal to:$t^3$$t^2+t$$|t^2+t|$$t\sqrt{t^2+1}$$|t|\sqrt{1+t^2}$