The correct option is A True
Frequency is a way to measure how often a particular event occurs.
For example when we toss a coin, the probability of getting a head is 50% or 12, this means that out of 100 trials performed 50 times head should appear. The frequency of getting a head is 50 out of 100.
Relative frequency is a way to measure how often a particular event occurs against total occurences.
For example, if a die is rolled 30 times and it shows the number 4, 10 times, then the relative frequency of the number 4 is 1030 or 13.
Therefore, option (a.) is the correct answer.