Which of the following is true regarding the solutions to the logarithmic equation below?
2log3(x)=4
log3(x)=4
x² = 34
x²=81
x=9.-9

x-9 and x=-9 are true solutions
x=9 and x=-9 are extraneous solutions
x=9 is an extraneous solution and x=-9 is a true solution
x-9 is a true solution and x=-9 is an extraneous solution