What is the recommended size for the /tmp partition?

What is the recommended size for the /tmp partition?

A.
512MB

B.
4096MB

C.
256MB

D.
1024MB

Explanation:
ESX and vCenter Server Installation Guide ESX 4.0, vCenter Server 4.0, page 62.
Table 7-2. ESX Optional Partitions

Mount Point Type Recommended Size
/tmp ext3 1024MB