Finding the current company curreny code in AX 2012

Here is the code to find the company currency code in AX 2012

Method 1:
currencyCode = Ledger::accountingCurrency(CompanyInfo::current());

Method 2:
currencyCode = Ledger::accountingCurrency(CompanyInfo::Find().recid);

Method 3:
currencyCode = CompanyInfo::standardCurrency();