In a SYN flood attack, bogus SYN packets flood the buffer because $($pick the best answer$)$

Question $6$ options:

a$)$

a flood of SYN packets without their corresponding ICMP Echo packet

b$)$

the buffer is too small

c$)$

a break in the sequence numbers of the ACK packet vs its corresponding SYN$-$ACK packet, sending many more ACKs without SYN$-$ACKs

d$)$

a break in the sequence numbers of the SYN packet vs its corresponding ACK packet, sending many more SYNs without ACKs