Which vаriаble is the lооp inductiоn vаriable? __global__ void SumArray(float* input, float* output, int N) { int tid = blockIdx.x * blockDim.x + threadIdx.x; float sum = 0.0f; for (int k = tid; k < N; k += blockDim.x * gridDim.x) { sum += input[k]; } output[tid] = sum;}