Answer: "d.The normal balance is on the increase side of the account." is TRUE.
Explanation: The option "A" is false because not all accounts have a debit balance. There are accounts with debtor balance and accounts with creditor balance.
Option "B" is false because all accounts can have debit and credit entries, even if they have a debit balance.
Option "C" is false because the accounts have no positive and negative results, they have debit and credit balances.
"Income accounts" are those that reflect a positive and negative result, according to the dynamic equity equation if they have a debit balance they reflect a negative result and if they have a credit balance they reflect a positive result.