What is the improvement of LSTMs over RNNs$?$

Question $2$ options:

$1)$

An LSTM can save input information from times much longer ago than an RNN$.$

$2)$

An LSTM allows two$-$dimensional or even higher$-$dimensional information input with time$-$series information. An RNN only allows one$-$dimensional information input with time$-$series information.

$3)$

An LSTM is not a substantial improvement over an RNN; LSTMs simply uses fewer parameters to achieve the same function as RNNs$.$

$4)$

None of the above.