Which of the following statements about the summarise$()$ function is false?

Question $26$ options:

summarise$()$ must always be spelled the British way $("-$ise"$).$

summarise$()$ is often used with the group$\_$by$()$ function.

The output of a summarise$()$ function is a single value per group.

Null values are not removed by default when using summarise$().$