Sicillian Question

I often play the Sicillian against e4,and I have a question. In a game I played a little less than a week ago, it went like this

1. e4 c5
2. Nf3 d6
3.c3 Nc6
4. d4

Is there any variation in which white does c3 to prepare for d4?

Sicilian Alapin, more frequently played with 1. e4 c5 2. c3.

BV

thanks

The "best" moves against c3 is d5 or Nf6 exploiting the fact that whites Qknight can´t reach c3.

FixarN

Thanks for the advice, I appreciate it.