Why was the following marked wrong?

lim$$x$1$

x $1$x$22$x $+1$

$=$

$00$

$=0$

$$ X $$ WRONG!

Limits of the form$$

$00$

$$equal infinity.

Limits of the form$$

$00$

$$are undefined.

$$

The limit does not exist at x $=1.$

Limits of the form$$

$00$

$$are not necessarily equal to zero.

What is the correct answer?

lim$$x$1$

x $1$x$22$x $+1$

$=$

DNE