Step 1: Understanding central tendency.
A measure of central tendency represents a single value that describes the center of a data set — the point around which the values cluster.
Step 2: Common measures.
The three most common measures of central tendency are:
1. Mean — arithmetic average of data.
2. Median — middle value when data is arranged in order.
3. Mode — most frequently occurring value.
Step 3: Analyze options.
- (A) Frequency is not a measure of central tendency.
- (B) Mean is correct.
- (C) Median is also correct.
Hence, both (B) and (C) are measures of central tendency.
Step 4: Final Answer.
\[
\boxed{\text{Both Mean and Median are measures of central tendency.}}
\]