Question:What is the best way to create global variables which can be used everywhere in Magento? 

A Creating a empty module and adding a system.xml file to it 
B Using the Magento Admin panel: System > Custom Variables > create a new custom variable 
C Via a Magento Session $myValue = 'Hello World'; Mage::getSingleton('core/session')->setMyValue($myValue); 
D $myValue = 'Hello World'; Mage::getModel('core/variable')->addMyValue($myValue); 

+ Answer
C 

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Mohammad Towhidul Islam

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