Which statement will create a $2$x$2$ char array called lettersand initialse each element with $\text{'}$x$\text{'}?$

a$.$

char letters$[][2]=\{\{\text{'}$x$\text{'},\text{'}$x$\text{'}\},\{\text{'}$x$\text{'},\text{'}$x$\text{'}\}\}$;

b$.$

char letters$[1][1]=\{\{\text{'}$x$\text{'},\text{'}$x$\text{'}\},\{\text{'}$x$\text{'},\text{'}$x$\text{'}\}\}$;

c$.$

char letters$[2][]=\{\{\text{'}$x$\text{'},\text{'}$x$\text{'}\},\{\text{'}$x$\text{'},\text{'}$x$\text{'}\}\}$;

d$.$

char letters$[2][2]=\{\text{'}$x$\text{'}\}$;