How is the output of a multi-head attention calculated? Answer choices Select an option By taking the weighted average of the outputs of all attention heads computed parallelly (each attention head is computed independent of the others) By concatenating the outputs of all attention heads computed sequentially (one attention head at a time) By concatenating the outputs of all attention heads computed parallelly (each attention head is computed independent of the others) By taking the maximum of the outputs of all attention heads computed parallelly (each attention head is computed independent of the others)