Consider this simplified payment processing pseudocode:

Consider this simplified payment processing pseudocode:

def process_payment(amount, card_info):
    if not validate_card(card_info):
        return "Invalid card"
    if amount <= 0:
        return "Invalid amount"
    if not charge_card(card_info, amount):
        return "Charge failed"
    record_transaction(card_info, amount)
    return "Payment successful"

What will be the output of process_payment(100, 'expired_card') if validate_card returns False for expired cards?