Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Conference | Regular Season Winner | Conference Player of the Year | Conference Tournament | Tournament Venue (City) | Tournament Winner |
| --- | --- | --- | --- | --- | --- |
| Atlantic Coast Conference | Duke | Pete Brennan , North Carolina | 1958 ACC Men's Basketball Tournament | Reynolds Coliseum ( Raleigh, North Carolina ) | Maryland |
| Big Seven Conference | Kansas State | Bob Boozer , Kansas State | No Tournament | No Tournament | No Tournament |
| Big Ten Conference | Indiana | None Selected | No Tournament | No Tournament | No Tournament |
| Border Conference | Arizona State | None Selected | No Tournament | No Tournament | No Tournament |
| Ivy League | Dartmouth | None Selected | No Tournament | No Tournament | No Tournament |
| Mid-American Conference | Toledo | None Selected | No Tournament | No Tournament | No Tournament |
| Missouri Valley Conference | Cincinnati | None Selected | No Tournament | No Tournament | No Tournament |
| Mountain States Conference | Idaho State | None Selected | No Tournament | No Tournament | No Tournament |
| Ohio Valley Conference | Tennessee Tech | None Selected | No Tournament | No Tournament | No Tournament |
| Pacific Coast Conference | Oregon State & California | None Selected | No Tournament | No Tournament | No Tournament |
Question:
What was the conference when Arizona State won the regular season?
Answer:
Border Conference