Regarding the statistical discrepancy in the balance-of-payments accounts,

a.

there is some evidence that financial transactions may be mainly responsible for the discrepancy.

b.

the sum of the balance on the capital account and the statistical discrepancy is very close to the balance of the current account in magnitude.

c.

there is some evidence that financial transactions may be mainly responsible for the discrepancy, and the sum of the balance on the capital account and the statistical discrepancy is very close to the balance of the current account in magnitude.

d.

it tends to be positive one year and negative in others, so it's safe to ignore it.