$4.$ Build $1$ a B tree, where p $=4,$ to index the attribute Job ID where JOB records were

recorded in this order:

JOB.Job$\_$ID attribute values:

FCC$8$ FCC$44$ FCC$51$ FCC$32$ FCC$16$ FCC$50$ FCC$37$ FCC$33$

TT$28$ TT$48$ TT$20$ TT$27$ TT$23$ TT$40$ TT$33$ LE$8$

LE$44$ LE$28$ LE$13$ LE$51$ LE$33$ LE$3$ LE$42$ CD$42$

FCC$51$ FCC$16$ TT$29$ TT$4$ TT$4$ TT$17$ TT$7$

LE$14$ LE$36$ LE$11$ LE$42$ LE$19$

CD$46$ CD$29$ CD$48$ CD$44$ CD$32$ CD$42$

a$.$ How many nodes are used?

b$.$ How many levels did the tree need?