What is the difference between the two codes?

a$)P=[91,{}^{\text{'}}]$;

b$>Q=[91,]$;

Select one:

a$.$ Code a initialises $P$ as a character array while code $b$ initialises $Q$ as an integer array

b$.$ Code $b$ initialises $P$ as a character array while code a initialises $Q$ as an integer array

c$.$ Both $P$ and $Q$ will be character arrays

d$.$ Both $P$ and $Q$ will be integer arrays