Read the following article and answer the question. Article: A Letter from Steve Jobs August 24, 2011 To the Apple Board of Directors and the Apple Community, I have always said if there ever came a day when I could no longer meet my duties and expectations as Apple's CEO, I would be the first to let you know. Unfortunately, that day has come. So I resign as CEO of Apple. I would like to serve, if the Board feels fit, as Chairman of the Board, director and Apple employee. As far as my successor goes, I strongly suggest that we name Tim Cook as CEO of Apple. I believe Apple's brightest days are ahead of it. And I look forward to watching and contributing to its success in a new role. I have made some of the best friends of my life at Apple, and I thank you all for the many years of being able to work alongside you. Steve More Information: Steve Jobs (February 24, 1955--October 5, 2011) was an American businessman, designer and inventor. He is best known as the co-founder, chairman, and CEO of Apple Inc. Unluckily, in 2003, Jobs was diagnosed with a pancreas neuroendocrine tumor . Although the cancer was treated in the first place, he appeared thinner as his health fell. On medical leave for most of 2011, Jobs finally made a decision to resign as Apple CEO in August that year. Shortly after that, on October 5, he died. He continues to receive honors and public attention for his influence in the technology and music industries. Question: What is Jobs' mood when writing this letter? Answer:

OPT:
1). Optimistic for the company;
2). Sorry for himself;
3). Grateful to his friends and co-workers;
4). All the above;
Answer:
4).