What is an efficient portfolio? What is the Capital Market Line (CML), how is it related to

Question:

What is an efficient What is the Capital Market Line (CML), how is it related to efficient portfolios, and how does it interface with an investor’s indifference curve to determine the investor’s optimal Is it possible that two rational investors could agree as to the specifications of the Capital Market Line, but one would hold a heavily weighted with Treasury securities while the other held only risky bought on margin?

Stocks
Stocks or shares are generally equity instruments that provide the largest source of raising funds in any public or private listed company's. The instruments are issued on a stock exchange from where a large number of general public who are willing... Portfolio
A portfolio is a grouping of financial assets such as stocks, bonds, commodities, currencies and cash equivalents, as well as their fund counterparts, including mutual, exchange-traded and closed funds. A portfolio can also consist of non-publicly...