An analyst is examining Proton Corporations pre-tax income of $3.2 billion last year. This includes $700 million of acquisition expenses and $600 million in restructuring expenses and $1 billion of other non-operating expenses. The recurring or core pre-tax earnings last year is closest to:

$3.2 Billion

$7.1 Billion

$5.5 Billion

$4.5 Billion