Read the excerpt from chapter 6 of The Joy of X by Steven Strogatz: But in the Hindu-Arabic system, it's a snap to write any number, no matter how big. All numbers can be expressed with the same ten digits, merely by slotting them into the
right places. Furthermore, the notation is inherently concise. Every number less than a million, for example, can be expressed in six symbols or fewer. Try doing that with words tallies, or Roman numerals.

Which sentence from the text helps the reader understand the meaning of concise?

•"All numbers can be expressed with the same 10 digits, merely by slotting them into the right places."
•"Every number less than a million, for example, can be expressed in six symbols or fewer."
•"With place-value systems, you can program a machine to do arithmetic."
•"Ten is marked by a position - the 10s place-instead of a symbol."