(1 point) How many 15-bit strings (that is, bit strings of length 15) are there which: a. Start with the sub-string 011? 4096 b. Have weight 8 (i.e., contain exactly 8 1's) and start with the sub-string 011? 924 c. Either start with 011 or end with 01 (or both)? 11264 d. Have weight 8 and either start with 011 or end with 01 (or both)?