Consider the question. Salman bin Abdulaziz Al Saud (Arabic: Salman ibn' Abd al -' Aziz Al Sa'ud Arabic pronunciation: ( smn ibn abdu aziz saud); born 31 December 1935 ) is a Saudi Arabian politician and royal statesman who has been King of Saudi Arabia, Prime Minister, Custodian of the Two Holy Mosques and head of the House of Saud since 2015.

Answer this question based on the passage: who is the current leader of saudi arabia?
What is the step-by-step reasoning process to arrive at the answer: Salman bin Abdulaziz Al Saud?
The relevant information is: Salman bin Abdulaziz Al Saud (Arabic: Salman ibn' Abd al -' Aziz Al Sa'ud Arabic pronunciation: ( smn ibn abdu aziz saud); born 31 December 1935 ) is a Saudi Arabian politician and royal statesman who has been King of Saudi Arabia, Prime Minister, Custodian of the Two Holy Mosques and head of the House of Saud since 2015.