?_global__voidfood_kernel(float*a,float*b,unsignedintM,unsignedintN){

unsigned int $n$ row $=$ blockIdx.$y*blockDim.y+$ threadIdx.$y$;

unsigned int col $=$ blockIdx.$x*blockDim.x+$ threadId.$x$;

$if(row<M$ && col $<N)\{$

$b[row*N+$ col$]=a[row*N+$ col$]\frac{?}{?}2\mathrm{.}1f+4\mathrm{.}8f$;

$\}$

unsigned int $N=300$;

dim$3bd(16,32)$;

dim$3gd\frac{N-1}{16}+1,\frac{M-1}{32}+1$;

$fo{o}_k$ernel $<<>>(a_d,b_d,M,N)$;

a$.$ What is the number of threads per block?

b$.$ What is the number of threads in the grid?

c$.$ What is the number of blocks in the grid?

d$.$ What is the number of threads that execute the code on line $05?$