Unit of account refers to the function of money where it serves as a common measure in which the value of goods, services, and assets are expressed. It allows for the comparison of different goods and services in terms of their monetary value. In this context, money acts as a standard unit of measurement.

Measure of value and measure of money are two concepts related to the function of money as a unit of account.

Measure of value:
- Money as a measure of value refers to its ability to represent the worth or purchasing power of goods and services.
- It enables us to compare and evaluate the value of different goods and services in monetary terms.
- For example, if the price of a pen is $2 and the price of a book is $10, we can say that the book is worth five times more than the pen in monetary terms.

Measure of money:
- Measure of money refers to the function of money where it acts as a tool for measuring the quantity of money in circulation within an economy.
- It helps in determining the total value of money supply, such as the money stock in an economy.
- This function is important for the central bank and policymakers to monitor and manage the money supply and monetary policy.

The answer:
- Money is accepted as a unit of account for both the measure of value and the measure of money.
- Money serves as a common measure in which the value of goods, services, and assets are expressed, allowing for comparison and evaluation.
- It also acts as a tool for measuring the quantity of money in circulation within an economy.
- Therefore, the answer is c. both of them.

In conclusion, money serves as a unit of account for both the measure of value and the measure of money. It allows for the comparison and evaluation of the value of goods and services in monetary terms and helps in measuring the quantity of money in circulation within an economy.