Strange line GQA

Sort:
MightyKingCole
1. d4 d5 2. c4 dxc4 3. Nf3 f6

I cannot see how to play this out. Any suggestions? 4.e4? 4.e3? I am thinking my opponent wants to threaten with e5
notmtwain
MightyKingCole wrote:
1. d4 d5 2. c4 dxc4 3. Nf3 f6

I cannot see how to play this out. Any suggestions? 4.e4? 4.e3? I am thinking my opponent wants to threaten with e5

I can't believe you will ever face that line, but if you do, e4 certainly makes sense.