The times (in seconds) taken to execute computer codes written by 16 students are given below. 78 79 80 80 80 81 81 82 82 83 87 87 89 89 90+ 90+ .The execution for the last two codes took too long to complete, and the exact values were not known at the time of recording. Hence, the values were listed as 90+. Which of the following statistical measures can still accurately calculated for all 16 values despite the two last values missing?

A. Mean B. Range C. Median D. Standard deviation