A key difference between concurrent and predictive validity has to do with:

${?}^a$ the time frame during which data on the criterion measure is collected

b$)$ the magnitude of the reliability coefficient that w$/$III be considered significant at the $\mathrm{.}05$ level

c$)$ the magnitude of the validity coefficient that will be considered significant at the $\mathrm{.}05$ level

d$)$ both b and c