Mahatma Gandhi had given advance notice of his 'Salt March' to Lord Irwin, who was the Viceroy of India at the time. This advance notice was a symbolic gesture of nonviolent protest, as Gandhi and his followers planned to march to the Arabian Sea coast in Dandi, Gujarat, and produce salt from the seawater as an act of civil disobedience against the British monopoly on salt production and taxation.

This iconic Salt March was a pivotal moment in India's struggle for independence, and it was conducted with the knowledge and notification to the British authorities, including Lord Irwin, to emphasize the peaceful and nonviolent nature of the protest. Lord Irwin was the British Viceroy who received this notice and had to deal with the civil disobedience campaign led by Gandhi.

So,the correct option is [3].