Which of the following statements about investments are true?(more than one option)

i. Unsystematic risks are usually nor evident in portfolios of more than 25 stocks;

ii. Sensitivity of a stock to systemic risks is measured by a beta-coefficient;

iii. Active investment can be described by strategic allocation of funds following analysis of the past price trends;

iv. Risk cannot be considered as a major consideration in well-diversified portfolios.