Which two items, found in the late 1800's, caused south africa to receive a wave of immigrants? rubies and emeralds platinum and silver diamonds and gold

Identify a true statement about media multiplexity.the choice of medium is primarily important in determining the strength of relationships.weak ties are uncomplicated and do not need many channels to sustain them.tie strength plays an insignificant role in determining the number of media employed by pairs.strong ties require less media than weak ties to orchestrate their varied and interdependent connection.