In the lstm$-5$yearsHourlyPM$2\mathrm{.}5$ example, we process the raw data into a $3$D format to be used by LSTM$.$ Let X be the processed $3$D dataset. The output of X$.$shape is $(43728,48,7).$ Which of the following statements is correct?

a$.$

X has $43728$ rows.

b$.$

X has $48$ rows.

c$.$

X has $48$ columns.

d$.$

None of the above is correct.