As a Finance Director of the selected firm, prepare an official MEMO to the firm's CEO/MD, evaluating the use of Islamic financing methods applicable to meet the firm's financing requirement, which you should identify based on the firm's objective of its "BUSINESS EXPANSION" Your memo should cover:

1) Appropriate explanation for choosing the relevant Islamic financing method(s)

P.s.The business expansion is for a telecommunication company, to develop and build the needed infrastructure for a new technology.