Terrorism is a complex, multidimensional phenomenon. Effective responses to terrorism need to take into account the evolving goals, strategies, and tactics of the terrorist groups we hope to deter. When seeking to demonstrate success in anti$-$terrorist measures, we cannot over$-$rely on quantitative measures. For example, quantitative data such as the amount of money spent on anti$-$terror efforts may correlate with, but not truly measure, progress. Conversely, a single data point, such as one incident of terrorism, can cause an entire country to feel terrorized. When considering our effectiveness in combating terrorism, we also need to include qualitative attitudinal data in our assessment.

Based on this passage, which of the following best characterizes the author's opinion?

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Quantitative data is the most important source of information.

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Qualitative data are more valuable than quantitative data.

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Quantitative and qualitative data should be considered together.

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Quantitative data should be collected first and then followed up with qualitative data.

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Qualitative data should be collected first and then followed up with quantitative data.