Which is true for the following code?

char usertext$[10]$;

userText $[]={?}^{\text{'}}{B}^{\text{'}}$;

userText $[1]=\text{'}O\text{'}$;

userText $[2]=\text{'}0\text{'}$;

usertext$[3]=\text{'}k\text{'}$;

userText $[4]\frac{?}{\frac{?}{?}}={?}^{\text{'}}{}^{\text{'}}$;

$...$

userText $[3]=\text{'}t\text{'}$;

The first four characters of the array userText are Book.

The first five characters of the array userText are Bookt.

The compiler generates an error because element $3$ can't be overwritten.

Printing the array userText will work fine because the new string is $4$ characters and the array size is $10.$