Investing Options (Vote)

I am looking for the best approach to investing in bitcoin over the next 12 months. I have a target of say Δ bitcoin/satoshi's, but I am unsure of the best way to reach the target. Here are some options I came up with:

a) Basic DCA once per week. Buying the same amount of bitcoin (0.02*Δ) each week over the next 50 weeks.

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b) Buying half of my BTC target now (0.5*Δ), and DCA 0.01*Δ bitcoin over the next 50 weeks.

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c) Buy nothing, but set limit orders if bitcoin hits certain lower prices, adding larger amounts of fiat at each level.

$25k @ 0.1*Δ | $22.5k @ 0.2*Δ | $20k @ 0.3*Δ | $17.5k 0.4*Δ

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d) Buy half of my BTC target now (0.5*Δ), and set limit orders if bitcoin hits certain lower prices.

$25k @ 0.05*Δ | $22.5k @ 0.1*Δ | $20k @ 0.15*Δ | $17.5k 0.2*Δ