Dr. David decides to invest $3 million in short-term fixed-income securities with an average duration of 3

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Question:

Dr. David decides to invest $3 million in short-term fixed-income securities with an average duration of 3 years and $3 million in longer-term fixed-income securities with an average duration of 7 years. What type of strategy is Dr. David using?
A. Barbell strategy.
B. Bullet strategy.
C. Long-short strategy.
D. Intermarket spread strategy.