An attention mechanism is processing a sequence of inputs. At the current position, indexed as i=8, the model needs to attend to a context window of key vectors from the last n_c=5 positions (including the current position). Which of the following notations correctly represents this specific set of key vectors?

A model is processing a sequence and is currently at position i=10. It is using a context window of size n_c=7. According to the notation { \mathbf{k}_{i-n_c+1}, \dots, \mathbf{k}_i }, the first key vector in this specific context window would be at index ____.

Determining Context Window Parameters