The portfolio standard deviation is not the weighted average of the standard deviations of its components, except a. in the case of zero correlation b. all of the provided answers c. in the case of perfect negative correlation d. in the case of perfect positive correlation If Fisher equation holds, then a. the correlation between real rate and inflation rate is one b. the correlation between real rate and inflation rate is negative c. the correlation between real rate and inflation rate is zero d. the correlation between real rate and inflation rate is positive Clear my choice