Series and Classes/Contracts Information:
| Existing | |||
| Status | Name | Ticker Symbol | |
| CIK 0000757928 | |||
| Series S000005943 | ZERO COUPON 2015 FUND | ||
| Class/Contract C000016388 | INVESTOR CLASS | BTFTX | |
| Class/Contract C000016389 | ADVISOR CLASS | ACTTX | |
| Status | Name | Ticker Symbol | |
| CIK 0000757928 | |||
| Series S000005944 | ZERO COUPON 2020 FUND | ||
| Class/Contract C000016390 | INVESTOR CLASS | BTTTX | |
| Class/Contract C000016391 | ADVISOR CLASS | ACTEX | |
| Status | Name | Ticker Symbol | |
| CIK 0000757928 | |||
| Series S000005945 | ZERO COUPON 2025 FUND | ||
| Class/Contract C000016392 | INVESTOR CLASS | BTTRX | |
| Class/Contract C000016393 | ADVISOR CLASS | ACTVX | |
IRS No.: 431920414 | State of Incorp.: MA | Fiscal Year End: 0930
Type: 485BPOS | Act: 40 | File No.: 811-04165 | Film No.: 13623031
IRS No.: 431920414 | State of Incorp.: MA | Fiscal Year End: 0930
Type: 485BPOS | Act: 33 | File No.: 002-94608 | Film No.: 13623032