Which Statements Best Describes a Characteristic of Variances

Which statements best describes a characteristic of variances?

A) Favourable variances are always debits to the variance account.
B) Unfavourable variances are always credits to the variance account.
C) Favourable variances occur whenever actual prices or actual usage of inputs are greater than standard prices or standard usage.
D) Unfavourable variances occur whenever actual prices or actual usage of inputs are greater than standard prices or standard usage.