I cannot understand that why (f) is inconsistent with strong-form efficiency. How to explain it?

Thanks! ??

Question Five Which of the following situations is inconsistent with the strongform version of the eicient markets hypothesis? Explain your answers. (21) Evidence indicates that, on average, investment fund managers do not consistently earn abnormal returns. (b) You make consistent abnormal prots by trading stocks aer the announcement of an unexpected rise in earnings. (0) You make consistent abnormal prots by trading stocks before the announcement of an unexpected rise in earnings. (d) In any given year; approximately half of all managed investment funds outperform the market. (6) Through your work in a corporate advisory rm, you become aware of a takeover deal before it is officially announced. You make prots by purchasing shares in the company that is to be taken over. (f) Your friend has been engaging in 'day-trading' on the Internet, and is showing a prot of 300% since he began trading four months ago