What is the error in the letters$[]$ array declaration?

char letters $\text{'}$C$\text{'},\text{'}$o$\text{'},\text{'}$m$\text{'},\text{'}$p$\text{'},\text{'}$u$\text{'},\text{'}$t$\text{'},\text{'}$e$\text{'},\text{'}$r$\text{'}\}$;

The array size is too small for the ASCII characters.

The array size is too big for the ASCII characters.

The array data type must be int.

The array data type must be float.