Why was the following marked wrong?

lim$$x$4$

x$^(3)64/$x $4$

$=$

$00$

$$undefined

$$ X $$ WRONG!

Limits of the form$$

$00$

$$equal zero.

Limits of the form$$

$00$

$$equal infinity.

$$

The limit does not exist at x $=4.$

Limits of the form$$

$00$

$$are not necessarily undefined.

What is the correct answer?

lim$$x$4$

x$364$x $4$

$=$